Lately, I’ve been very interested in analyzing hitters who make a living off crushing everything in the upper third of the strike zone. As the rise of four-seamers up in the zone has turned that area into a hole for more hitters (especially in terms of whiffs), having someone in the lineup who excels in that area is very valuable. As I perused the leaderboards looking for the best hitters in the upper third, I had an expectation that most, if not all, of them would either have a very flat swing or be on the shorter side with shorter arms. It’s a simple story. If your swing is flat, you’re on plane with the pitch. And if you’re a shorter player or have shorter levers, you should be able to get on plane with pitches in the upper third very quickly.

That story is mostly true, but it wouldn’t be baseball if there weren’t an exception or two. Here is the list of the top 10 hitters against pitches in the upper third by xwOBA in 2024. I used a 15-hit minimum to ensure my focus was on the players who have had success with batted balls in this area:

Read the rest of this entry »

After last year’s disappointing follow-up to their 2023 World Series-winning season, the Texas Rangers jumped the first base market in December and improved the rest of their roster in the process. First, at the Winter Meetings, they acquired corner infielder Jake Burger in a trade with the Miami Marlins, a move that gave us one of Michael Baumann’s best headlines: “Everything Is Burger in Texas.”
Burger’s addition made incumbent first baseman Nathaniel Lowe expendable; sure enough, a few weeks after the Burger trade, Texas sent Lowe to the Washington Nationals for left-handed reliever Robert Garcia.

Immediately after moving Lowe, the Rangers added some thump to their lineup with the signing of Joc Pederson to a two-year, $37 million deal with a mutual option for a third season. Altogether, the three moves essentially function as a two-for-one lineup swap, one that should provide more power to this offense, and also come with the bonus of fortifying their bullpen with a solid lefty who has yet to reach arbitration. Read the rest of this entry »

I’ve been a fan of Brent Rooker since he was crushing baseballs at Mississippi State, so it was exciting to see him elevate his offense in 2023 after three years of struggling in the majors. His improvements stemmed from changes he made to his load. He added larger, slower movements as he prepared to swing, which helped him to generate more power while keeping his body under control. To do this, he switched from a simple toe tap to a more dramatic foot hover, allowing him to do a complete hand row while loading and giving him more time to sync the rhythm of his upper and lower body before exploding toward the ball.

The result was a breakout season in which he batted .246 with 30 home runs and a 126 wRC+. Despite his improvements, though, Rooker was not a finished product. Strikeouts have always been part of his game, so his 32.7% strikeout rate wasn’t all that surprising even after his adjustments. Teams accept whiffs as a necessary tradeoff for more power, but all these strikeouts were indicative of a hole in Rooker’s swing that limited his value.

From 2020-2023, Rooker had one of the steepest swings in baseball, making it easier for him to launch the ball in the air. But unlike other steep hitters, such as Mike Trout and Freddie Freeman, Rooker didn’t have the variability to alter his swing to get to pitches outside of his wheelhouse. This left him exposed to high fastballs. Even as he slightly dropped his VBA in 2023, he still ran a 40% whiff rate and .285 xwOBA on pitches at the top of the zone. That was the 16th-worst whiff rate out of 217 hitters who saw at least 1,500 pitches that season.

This all relates to the balance that hitters with steeper swings have to strike. Yes, it’s easier to create launch with a steeper angle (duh!), but you don’t want to be one dimensional to the point where you’re taking the same swing every time. It’s a problem that a lot of younger hitters are forced to reckon with when they reach the big leagues because pitchers simply have nastier stuff and are better at executing. Although Rooker developed a better idea of how he could be successful in the big leagues, he still had a major hole to address. Boy did he do that this past season!

Across 614 plate appearances this year, Rooker was one of the best hitters in baseball, batting .292 with 39 homers, a 164 wRC+, and a .510 xwOBACON (99th percentile), while his strikeout rate dropped to 28.8%. Those are big improvements across the board. Perhaps unsurprisingly, his success this season came with a flatter swing, which had a positive impact on his performance at the top of the zone:

It’s a simple story to track. On average, Rooker’s swings were flatter at contact, giving him a better chance to be effective at the top of the zone where pitchers were likely to target him this season. He took the biggest hole in his game and made it a smaller one; as a result, his strengths played up more. Of course, that’s easier said than done, so it’s worth examining how he did it. Now comes the fun part of the analysis.

Thinking in terms of reciprocal movements, in order to get to a different angle at contact, it seems likely that Rooker changed his initial position. And what do you know? That’s exactly what happened! Once again, he altered his setup. The following swings are all against fastballs in the upper third of the zone, three from 2023 and three from this past season:

2023

2024

Here, you’ll notice two changes that had a direct impact on the path of his barrel: His hands are higher and his stride leg is slightly open. He most likely opened up his front leg to improve his balance and/or change his rotational direction. Right now, though, I’m more interested in his adjusting his hand position.

Typically, batters raise their hands to make it easier to maintain a flatter barrel, make contact deeper in the zone, and shorten their swing length. That all sounds wonderful, but some sluggers refrain from this adjustment because it becomes more difficult for them to create launch. Turns out, that wasn’t the case for Rooker; his flatter swing was still steep enough to crush balls in the air.

The other benefit here is just as important. Having higher hands allowed him to make contact deeper in the zone. Look at the final clip above from 2024. Even though he was late on this fastball, he could still rip a single to right center. We don’t have swing length data from 2023, so we can’t say for sure that Rooker’s swing was shorter in 2024, but batters with higher hands tend to have shorter, flatter swings. Pitches at the top of the zone get on batters more quickly than pitches in the middle or lower thirds. To hit those high pitches, batters need to get their barrels into the zone sooner, and shorter, flatter swings cut down the space that batters need to cover to get to the point of contact. This adjustment would explain Rooker’s improvement on pitches up in the zone.

Rooker’s path to stardom has been a fantastic player development story. He was not complacent after his initial breakout in 2023. Instead, he made additional adjustments to his profile. Many players want to fix their weaknesses, but it’s incredibly hard to do so. That Rooker identified and addressed the hole in his game so quickly is a testament to his talent and makes me more confident that he’ll continue to be one of the game’s top hitters for a while.

As a player’s body changes over time, the same movements he used to make may not work well for him anymore. Adjusting to these changes (or not) will make or break his career. These changes have been especially stark for Giancarlo Stanton. The 35-year-old slugger serves as an interesting case for observing how great hitters can alter their swings over time to adjust to their changing physical attributes.

Stanton had a 116 wRC+ in 459 plate appearances in 2024 – the 15th season of his career. That’s nearly identical to the 118 mark he set across 396 plate appearances as a rookie in 2010. The difference between Stanton then and now, though, is night and day. Let’s take a look at Stanton at age 20 to get an idea of what his swing was like during his first major league season:

Open stance, non-neutral shin angle, slight hand row. None of these things are currently present in Stanton’s swing. None. When he came up, he looked like an uber-athletic NFL tight end. He could run well, move fluidly, and was twitchy enough to have a bit of extra movement in his swing (compared to recent years) and still have success. Yeah, he struck out over 30% of the time in his rookie campaign, but he was still learning big league pitching. He boasted a 141 wRC+ the following season with a very similar swing. It wasn’t until his third season where there was an obvious change. This was when Stanton showed what he was really capable of at the plate (and when he started going by Giancarlo):

Now that’s what I’m talking about. These are truly Stantonian homers here. In 2012, Stanton raised his wRC+ to 158, delivering 5.1 WAR in just 123 games. He cemented himself as one of the scariest sluggers in the game, and much of that should be attributed to his mechanical adjustments. He changed his stance to a neutral position and raised his hands up a considerable amount. From this point on, his hands would stay in a higher slot. His hand row from the previous two seasons always brought him to a higher point than where he started in his setup. As a player with 80-grade power, he didn’t really need that extra movement to create force. Depending on your body type (arm length, upper body flexibility, etc.), swinging a flat bat from a high slot makes it easier to get your bat on plane. Since he wasn’t the type of hitter who varies his shoulder plane all that much, it was a logical change to simplify his approach.

Even with these changes, we’re still pretty far off from where Stanton has been over the last few seasons. He maintained these mechanics throughout 2012 and 2013. However, during this time, health became an issue. He missed time in both of these seasons for knee, abdominal , ankle, thigh and shoulder injuries. Without biomechanical data, we can’t definitively say these injuries forced his body to change and/or he had to adjust his swing to compensate for his compromised health, but my goodness, those are injuries almost from head to toe! It wasn’t until the 2014 season that Stanton played over 140 games in a single season. And unsurprisingly, he came into that year with another modified setup:

This is the first time in his career where we saw Stanton narrow his stance. I’m theorizing here, but taking away movement could have had two benefits for him: Similar to my point before, he is so strong that he never really needed to move all that much to create power, and less movement would give him a better shot at making contact. Second, by narrowing his stance and not crouching as much, he would put less stress on his body. He ended this season with a 161 wRC+, the highest mark of his career. He also remained healthy until the middle of September, when he was hit in the face by a pitch that prematurely ended his season.

The narrowed stance kept working for him in 2015. Across his 74 games to start the year, he scorched 27 home runs — a full-season pace of 58. But on June 26 — his 74th game — he broke his hamate bone swinging at some point during his final two at-bats, both strikeouts, and missed the rest of the season.

The one thing about Stanton’s swing that he has never really reconciled is that he doesn’t decelerate much. I think this is a big reason why we see such egregious whiffs from him. Once he gets started, there is no slowing down. It also comes with some added risk of injury. This is such a violent swing, and his body bears the brunt of that force because he doesn’t have the brakes in place to come to a controlled stop.

Although he was healthy to start the season in 2016, it was clear the injury had compromised him. By the end of the year, he’d completely gotten away from the setup that he’d had so much success with before the hamate injury. In fact, he returned to a similar stance that we saw from him early on in his career:

Forward lean, slightly open hips, and more knee bend. Sound familiar? That’s because this is essentially rookie year Stanton, not the great hitter he was in 2014-2015. His performance also reverted back to where it was in 2010; his 118 wRC+ in 2016 was identical to his mark as a rookie. It makes sense, then, that he ditched this setup in 2017. Closed stance Stanton has entered the chat:

Stanton didn’t close his stance off until about June, but he didn’t run it back the first few months with the stance he used during his down 2016 season. He came into 2017 with the same stance he had in 2014-2015, when he was raking. But from the summer on, he closed things up, finishing the season with 59 home runs and winning NL MVP. It was a special run that completely took off due to another mechanical change – probably the most important of his career.

Stanton was traded to the Yankees following the 2017 season and showed up with the same exact setup, and for good reason. After struggling big time out of the gate, he ended up with a 128 wRC+. Not great but still very good. He was healthy for pretty much the entire season too, playing in 158 games. Then in 2019, the injuries piled up. After a knee injury that kept him out for almost the entire year, he returned in the playoffs and sustained a quad injury. Then it was hamstring injury that limited him to 23 games during the shortened 2020 season. Over the two years, he played in a total of 61 regular season games.

Unlike other times in his career, Stanton’s injuries in those seasons didn’t lead to a mechanical overhaul. At this point in his career, he knew what the best version of himself looked like. If he could get his body back to feeling healthy, it made sense not to go through any big changes. And in 2021, that worked out well. He swatted 35 homers in 139 games and finished with a 138 wRC+. He suffered a minor quad strain early in the season, but other than that, he was healthy all year.

Though he missed 10 days with a minor calf strain in late May/early June, Stanton was also mostly healthy for the first half of 2022, and he hit well enough to make the All-Star team (133 wRC+ during the first half). But then the lower body injuries returned, and this time they were even lower than before. He made it three days into the second half before landing on the IL with Achilles tendonitis. He missed just over a month, and when he came back in late August, it took him about two weeks to get going. He also had a minor injury scare when he fouled a ball off his foot on September 5; he wasn’t in the lineup for the Yankees’ next four games, though he did pinch hit in two of them. He caught fire upon returning to the lineup on September 10, posting a 133 wRC+ with seven home runs over his final 79 plate appearances of the regular season.

Still, these particular injuries represented a new challenge for Stanton. As a closed-stance hitter, he is far more reliant on his connection to the ground, making these repeated injuries from the ankle downward especially concerning. Not only does he have to regain his strength, but he also has to figure out how to move in space and interact with the ground. This gets more difficult for players as they age and the injuries compound. The thing about Stanton, though, is he has always been willing to tweak his mechanics. However, he needed to hit rock bottom before deciding to go away from the setup that he’d had so much success with for so long.

Health was a problem for Stanton again in 2023. He strained his hamstring in April and missed almost two months. Upon his return, he was far off from his diminished 2022 form, when he finished the year with 113 wRC+, which to that point was the worst mark of his career. His 86 wRC+ to end the year was bleak. He stayed healthy after his return, but the awful performance brought up the question: Was this just too much for him to overcome? For Stanton, the answer was to do what he had done so well for his entire career. He made some more changes, this time to his mechanics and his body.

There was a lot of discussion around Stanton’s adjustments at the beginning of 2024, including this comprehensive look from Jay Jaffe. In short, the main point was that he slimmed down (a lot!) and shifted closer to the neutral setup he had from 2014 and 2015 rather than the extreme closed stance he had employed beginning in June of 2017.

This goes back to the talk about matching your swing to your physical attributes. Stanton has dealt with so many lower body issues over the last five years, and they have impacted what he can do physically. He couldn’t sustain the same movement pattern in the closed stance with his current body, so he went to a similar version of the swing that his body could handle. His regular season still wasn’t great, but it was a major step up from the year before. And when you consider the show he put on in October, it’s safe to say his changes worked pretty well overall. For a last look, let’s see where he stands as of October, from a mechanical perspective:

Whatever your opinion is of Stanton’s career, how he projects for the rest of it, or anything related to that, there is no denying that what he has done throughout the last 15 years has been remarkable. There aren’t many hitters who can change as much as he has and still have success. A big part of being a great baseball player is making adjustments. Stanton has done that incredibly well for a long, long time.

Aaron Judge is the best hitter on the planet. Over the last three seasons combined, he has a 202 wRC+. We’re witnessing one of the best stretches by any hitter in baseball history, full stop. The fact that a player as great as Judge can struggle as much as he did this postseason (113 wRC+ in 64 plate appearances) is telling of how slumps can happen to anybody at any time, regardless of talent. You could chalk it up to randomness, and you’d probably be right, but randomness doesn’t mean there isn’t a reason for it.

For example, hitters can find their mechanics out of whack, sometimes with no explanation. When that happens, they look to address the inefficiency and get themselves back on track. Sometimes it’s bad luck, but oftentimes it’s mechanics. Those blips can explain why hitters go through ups and downs. And depending on who you are and what your hitting style is, the fluctuations can be wide.

During the World Series, when Aaron Boone was asked if he thought Judge was pressing at the plate, he made a comment that stuck with me. Boone said, “… it can always be a little bit of a mechanical thing.” It’s not exactly clear if he meant that for Judge specifically or for all hitters, but regardless, I think it illuminates the mindset of players when they work through slumps. Depending on the shape or severity, it usually pushes hitters to get in the cage to figure out what tweak will unlock the best version of themselves. With Judge in particular, any mechanical issues can completely disrupt his bat path. Let me clarify that a bit further. Read the rest of this entry »

It’s the most wonderful time of the year: October baseball. As always in the playoffs, I’ve been keen to observe lineup construction and offensive personnel, particularly from a bat path perspective. Over the last few years especially, the matchup game has become more and more important as managers navigate the platoon advantage that comes from switching pitchers in and out of the game.

In 2023 and 2022, I explored how Vertical Bat Angle (VBA) can serve as a proxy for analyzing swing diversity in a team’s lineup. At first it started as a way of investigating why the Astros were so consistent in the playoffs, then it became a way for me to understand which lineups have the most versatility in bat path and handedness. In theory, the more versatility, the harder it is for a pitcher-catcher combination to game plan. If a lefty with a flat bat path hits ahead of a righty with a steep bat path — as is the case with Juan Soto and Aaron Judge — a pitcher is forced to execute two different approaches. If that variance carries through an entire lineup, good luck! Spoiler alert, I’m basically describing the Dodgers, but more on that later.

As I’ve said in countless blogs of mine, VBA is not a catch-all metric for describing bat path. Attack Angle (AA) and Vertical Entry Angle (VEA), among other metrics, are important for understanding the full story of each player’s path. But in this piece, I’m going to stick with just VBA because that’s what I’ve used for this piece in previous years. Here are a few key points that are important to rehash before showing the results.

For left-handed hitters, I made their average VBA negative to account for the fact that they swing from the other side of the plate. (VBA data is provided by SwingGraphs.) For switch-hitters, I multiplied their average VBA by -0.72 because the league-wide rate of switch-hitter plate appearances that come against righty pitchers — when they are batting lefty — is 72%. Additionally, even though I used regular-season VBA data, I included only hitters who’ve recorded at least one playoff plate appearance this year in the sample. By not including guys who didn’t bat during the postseason, the dataset is more representative of each playoff team’s VBA variance based on how its offense is currently constructed. With the remaining group of players, I took the variance of the VBAs on the given team and adjusted it to be a percentage above or below average. The average is set at 100, just like wRC+. Without further ado, here is the update on VBAVar+ for 2024:

As I alluded to earlier, the Dodgers come out on top this year. Their addition of Shohei Ohtani is a big help. Shocker! He comes before Mookie Betts, who is then followed by Freddie Freeman. From a VBA perspective, these three hitters offer immediate variance atop the lineup. Ohtani’s VBA sits around 34 degrees on average (although we know he can alter his swing a ton). Betts offers a very similar VBA at just around 33.7 degrees, but his comes from the other side of the plate, and he is much shorter than Ohtani. After that, Freeman has one of the steepest swings in baseball at just over 40 degrees on average. The different angles are one way to illuminate how different they are as hitters. They force pitchers to execute multiple pitches in different locations because each of them has different strengths or weaknesses due to the shapes of their swings.

Being without a healthy Freeman takes a versatile layer out of the lineup. The first baseman is nursing a sprained ankle and bone bruise, an injury that would typically warrant a recovery time of four to six weeks. He did not play in the Dodgers’ 8-0 win over the Padres in Game 4 on Wednesday, but he is in the lineup for Friday night’s Game 5. Either way, he is not at full strength. During his Game 4 absence, Max Muncy moved over to his old home at first base, while Chris Taylor and Enrique Hernández split the third base duties. As the Dodgers showed in their Game 4 rout, they have plenty of other boppers following the three stars in their lineup. It starts with Teoscar Hernández’s neutral VBA of 33-34 degrees. He is followed by Muncy’s slightly flatter swing (31 degrees). Then comes the righty Will Smith with his steeper angle of about 36 degrees. The bottom third is highlighted by Gavin Lux and Tommy Edman, who provide pitchers another different look with their flatter swings (both less than 29 degrees on average). I know, I basically listed the entire lineup, but that’s exactly the point: The Dodgers have a ton of talented hitters with different swing profiles, making it very difficult for pitchers to come up with a concrete gameplan to get them out. Last season, the Dodgers were second in this metric. The additions of Ohtani, Teoscar Hernández, and Edman, as well as the return of Lux from injury, have helped push the Dodgers to the top of the list.

The Yankees also have plenty of star power in their lineup. They’ve struggled offensively thus far through their four playoff games and are just slightly above average in terms of lineup swing variance. Judge is their only hitter in this sample who has an average VBA above 33 degrees. However, as I mentioned earlier, the top of their lineup is all the more dangerous because their two best hitters, Judge and Soto, have completely different VBAs. Judge’s is 41 degrees, while Soto’s is 26, and they also come from different sides of the plate.

The Padres and Royals appear third and fourth on this leaderboard, respectively. San Diego’s placement is largely due to its ability to rotate left- and right-handed hitters. On Wednesday, the Padres’ lineup went like this: L, R, L, R, L, R, L, R, L. There is one spot that sticks out especially: Batting Manny Machado fourth and Jackson Merrill fifth. Machado’s flat swing is geared toward crushing heaters, while Merrill’s steeper swing (and versatility) allows him to hit sliders well. If pitchers want to spam sliders to Machado, they’re forced to adjust quickly and take a different approach with Merrill. Yes, that’s possible. But if it makes things even just slightly more difficult for pitchers, it’s worth it.

Kansas City is quite different from the other teams discussed so far because its offense is top heavy. Bobby Witt Jr. and Salvador Perez are the two key threats. If you’re not going to overwhelm pitchers offensively with a bunch of star power, at least give them varying looks, right? That’s what this lineup does. The Royals have a handful of lefty hitters with different VBAs, ranging from Kyle Isbel (very flat) to Adam Frazier (very steep). The Tigers, the other AL Central team to secure a Wild Card berth, are a similar story.

The Tigers have done just enough offensively during the playoffs so far. They haven’t really had a big breakout game, but their versatility has allowed A.J. Hinch to make pinch-hitting decisions that put his team in a better position to play against the strengths of Detroit’s opponents. A good example of this came in Game 2 of the Wild Card Series against the Houston Astros, when Andy Ibáñez pinch-hit for Zach McKinstry against left-hander Josh Hader in the eighth inning. From a handedness perspective, the move is straight forward; McKinstry bats left-handed while Ibáñez is a righty. But what makes this an especially shrewd move is the fact that, from a bat path perspective, Ibáñez might be an ideal matchup for the Tigers against Hader. Hader has a flat approach angle on his fastball, which he’s trying to keep above the bats of hitters, and Ibáñez has a flat swing — on average, his VBA hovered between 26 and 27 degrees this season — which helps him to avoid swinging beneath higher pitches. That’s exactly what happened. Hader fired a sinker up in the zone, and Ibáñez hammered it for a go-ahead double.

And sometimes, you have similar personnel who are all playing so well that having variance doesn’t matter all that much! That is exactly what’s happening in Queens. Almost the entire Mets lineup is within five degrees of VBA. The only exception is J.D. Martinez, who has a steeper path in the high 30s. I don’t think the Mets’ position all the way down on this leaderboard is a bad thing; good hitters are good hitters regardless of their swing paths. Putting together a lineup with a high VBA variance is just one way to build a winning team, but it’s far from the only way.

This is the third year I’ve done this exercise and it’s one of my personal favorites. The more context that can be added to a team’s lineup, the better you can understand matchups and managerial decisions. In the small sample of the playoffs, teams have to flex whatever competitive advantage is available. When you have the personnel to make life harder for your opponents, you better exercise it.

If you’re into relief pitching and pinch-hitting, boy was Game 3 of the ALDS between the Cleveland Guardians and the Detroit Tigers the game for you. On the surface, it was fairly straightforward, a low-scoring affair that featured good pitching and a couple of timely hits. But look beneath the surface and you’ll see that it was quite a quirky game, one that would be difficult to explain to casuals (not derogatory!). Why was a healthy hitter pulled before he got an at-bat? Why did one of the biggest offensive threats on the Tigers get pulled in the fifth inning? Truly, it was a dream game if you love talking about the intricacies of baseball with your friends. And lucky for me, you’re all my friends today.

Let’s establish a few of the details before we dive into some of the nerdier aspects of Wednesday’s game. The Tigers won 3-0 to take a 2-1 series lead against their division rivals. Just as he had the last few months, A.J. Hinch put his faith in his bullpen, a unit that posted a 3.00 ERA (fourth in the game) in the second half as the Tigers put together the best record in the American League over that stretch. They delievered another superlative performance, and now his team has a chance to close out a playoff series at home Thursday night. Imagine telling Tigers fans that was possible in July!

There are 26 players on each of these flawed but fun AL Central rosters. Realistically, four of those 52 players (the starting pitchers from Games 1 and 2) weren’t going to appear in Game 3 unless it went a gazillion innings, leaving 48 who might see action. The Tigers used six pitchers and the Guardians used seven. Both teams used three pinch-hitters, while the Guardians also called on Austin Hedges as a defensive replacement (he ended up getting an at-bat), making for seven total substitutions between the two teams. Add those hurlers and pinch-hitters to each team’s starting lineup, and you end up with a whopping 38 players used! Not quite every player, but for a nine-inning game, that’s a lot! And all that mixing and matching added a fascinating dimension to the chess game, especially the pinch-hitting. Read the rest of this entry »

Julio Rodríguez’s season was growing bleaker and bleaker by the day as he labored through the longest slump of his short career. We had expected him to get right sooner than later — after all, he’s one of the most talented players in the sport, with an explosive bat, top-shelf sprint speed, and a cannon of an arm — but it was worrisome to see him struggle for so long. He had an 86 wRC+ across 360 plate appearances at the end of June.

Over the last few months, though, Rodríguez has progressively figured things out, with his turnaround culminating with his current heater. Since July 1, he is batting .321/.377/.545 with 12 home runs and a 166 wRC+, and over his last 10 games, fueled by his .458/.471/.833 line, five homers, and 270 wRC+, he’s added 1.3 WAR to his ledger. He is a key reason why the Mariners are still in the playoff race with less than a week remaining in the season, though you could also make the case that his overall underperformance is one of the reasons why Seattle is barely hanging around. Either way, to better understand the story of Rodríguez’s season, we have to dive deeper into his struggles.

Rodríguez pitch-by-pitch performance data show he spent the first three months of the season almost exclusively hunting fastballs, which isn’t a bad idea considering he feasts on them. The problem was that because his eyes were focused only on one speed, he started swinging at any pitch that he thought might be a fastball, and as a result, he was chasing too many breaking balls and offspeed pitches.

During the first three months of this season, Rodríguez may have been the worst everyday hitter against offspeed pitches in the entire sport. Among the 260 batters who saw at least 50 offspeed pitches outside the zone through the end of June, he had the second-worst chase rate at 54.9%, behind Nick Gordon. As a result, Rodríguez had a .157 wOBA against offspeed pitches, which dragged down his overall numbers, especially because he also had trouble against breaking balls (.232 wOBA).

Rodríguez’s feast-on-fastballs approach corresponded with a swing deviation that limited his production. In previous seasons, Rodríguez thrived because of his swing variability, which allowed him to do damage against different pitches in different locations. That is an essential skill for him because he is one of the more aggressive hitters in baseball. However, during the first months of this season, because he seemed to be selling out for fastballs, his hacks were too noisy on most of his swings. That type of one-dimensional swing is designed to crush higher-velocity meatballs — and, even as he struggled, he was still doing that — but it is susceptible to pretty much everything else.

When looking at SEAGER, it becomes clearer that Rodríguez truly did have an eat-the-meatball approach. Yet despite his increased chase rate against offspeed pitches, his SEAGER has actually improved from last year. His Selectivity% is about league average as of this week, in the 54th percentile (mainly due to recent improvements), but his Hittable Pitch Take% is in the 97th percentile, meaning he is rarely letting pitches he can damage pass him by. Altogether, he is in the 95th percentile for SEAGER, a jump from last year’s 69th percentile score. At first glance, this might seem contradictory, that he’s making better swing decisions during his worst season. But just because he is swinging at hittable pitches doesn’t mean those swings have enough variability to produce against pitches with different speeds and locations.

The thing is, even though Rodríguez was hunting heaters with a swing that is tailored to damage them, it doesn’t seem like he intentionally altered his mechanics. Rather, the two changes likely came about simultaneously and spiraled as they reinforced each other. Here’s what probably happened: After getting off to a slow start, he began pressing to break out of his funk and tried to clobber the most hittable pitches he saw, leading to a one-dimensional, fastball-dependent swing.

Rodríguez is at his best when he has a flatter Vertical Bat Angle (VBA). VBA is the angle of the barrel relative to the ground at contact. So that means his best performance has come when his bat has been flatter at contact. That could mean deeper contact and/or a flatter entry into the hitting zone. Flat swings don’t work for all hitters, but for a someone like Rodríguez who creates so much bat speed deep in the zone, they typically are a recipe for success. Over the first three months of the season, Rodríguez had the steepest VBA of his career, ranging between 33.4 to 35.5 degrees; this stretch coincided with his below-average offensive production. Since the beginning of July, though, he’s flattened his VBA to somewhere between 30 and 31 degrees, much more in line with his career norms.

Rodríguez’s upper body mechanics are crucial to his swing because they determine the path his bat takes to the ball. He has a louder bat row, similar to those of Vladimir Guerrero Jr. or Rafael Devers, two hitters who also have swings on the flatter side. Noisy movements help batters generate power and time up their swings, but with more movement comes more room for error when something goes awry. Having an effectively loud swing requires maintenance and attention to ensure the delicate balance between power and control doesn’t fall out of whack.

If Rodríguez’s swing had unintentionally become more vertically oriented because of a different setup or row, that could have disrupted where he perceived his bat to be in space (proprioception) and hindered his contact quality and frequency. This all makes sense in theory, but let’s confirm it with some video analysis. The first two swings below are from May and the next two are from July:

May

July

You can see a much more toned-down bat row in July compared to what it was in May. Since Rodríguez isn’t moving it as aggressively in the pre-swing, his bat starts on a flatter plane when he descends into his downswing. That helps decrease the amount of time it takes to get his barrel into the zone and is more in line with where his swing has been in the past.

Now, let’s compare two swings, one from last season when he was rolling, and another from the second half of this season, as he returned to form:

2023

His mechanics aren’t identical, but they are much closer now than they were when he was struggling during the first few months of this year. Pay attention to the angle of his bat throughout the row and how far his hands drift from his body. Maintaining the connection between his barrel/hands and the rest of his upper body is paramount for him to control his barrel.

As a last piece of information to consider, I was curious about how Rodríguez’s bat speed changed as his row calmed down a bit and his swing flattened back out. This month, his bat speed has ticked up significantly compared to the first three months of the season. He’s swinging at an average velocity of 77.7 mph in September, a sizable spike from April through June, when his average swing was just under 76.0 mph. If flatter means faster, then it sounds like he should stay where he’s at right now.

Any Mariners fan would tell you that in the first few months when Rodríguez was struggling, he was clearly pressing. Any player would tell you that when you start pressing, your swing can regress because of it. You try and hack your way back to your normal numbers and get too far from the best version of yourself. It’s an intuitive story.

Considering the Mariners were just eliminated from the AL West race Tuesday night and currently sit 2.5 games out of the final Wild Card spot with four games to play, it would have been nice for them to have gotten this version of Rodríguez a bit sooner. But the season isn’t over just yet. Maybe the young superstar can propel his team into an unlikely playoff berth. After “The J-Rod Show” got off to such a slow start this year, that would be an especially epic season finale.

Except for the standings, which include Tuesday’s results, all stats are updated as of Tuesday morning.

I will always have an affinity for hitters with a knack for vertical bat variability. To effectively cover pitches at different heights in the strike zone, a hitter has to vary the angle of their bat relative to the ground to create lift. To hit a pitch at the top of the zone for a line drive, the bat should be flatter, and to lift a pitch at the bottom of the zone for a line drive, the bat should be steeper. It’s a simple concept that some hitters can execute with more consistency than others. Jackson Merrill is one of those guys.

When I first really started getting into the mechanics of hitting, Mike Trout was the dude who made it easy to understand vertical bat variability. Vintage Trout’s lower half looked almost identical across all swings, but depending on the height of the pitch, his entire torso angle would adjust. Through the years, players like Michael Brantley, Freddie Freeman, and Trea Turner have all executed impressive levels of vertical bat variability, too. And unsurprisingly, they all maintained (or still do) strikeout rates well below the league average with great gap-to-gap line drive skills. When Eric Longenhagen first compared Merrill’s swing to that of Brantley, I became very impatient anticipating what the Padres outfielder would do in the big leagues. So far, he’s exceeded expectations.

Through his first 121 career games, Merrill has hit for a 125 wRC+ with a .290/.321/.484 slash line. Over the past month, he’s found his power stroke to go along with his superb line drive swing, and during that span, he’s been one of the best hitters in baseball, with a 182 wRC+ across 104 plate appearances. It’s come at a good time for the Padres, who have picked it up and are only three games behind the NL West-leading Dodgers.

Merrill’s sound mechanics and production at the plate are all the more impressive considering that he is still just a 21-year-old rookie who is also learning a new position. Although his outfield experience in the minors was limited to 45 innings in left field last year at Double-A, he’s already turned into one of the top defensive center fielders in the game (6 OAA).

His ability to go down and get it with the best of them while still covering the top of the strike zone is the key to his success so early in his career. Below is a table highlighting his performances in both the upper and lower thirds of the zone:

Elite hitters have all different shapes of production. Juan Soto mashes everything at the top of the zone, Aaron Judge crushes everything in the heart, and Yordan Alvarez demolishes everything down low. But it’s uncommon for hitters to be this productive on both high and low pitches. In fact, among the 194 hitters who’ve seen 1,250 pitches this season, only two other players have xwOBAs that rank in the top 30 on pitches in both the upper and lower thirds of the zone, Ketel Marte and Marcell Ozuna, who are two of the best 11 hitters in the game by wRC+. Merrill and Ozuna are the only two hitters with top-30 xwOBAs in all three vertical thirds.

As I said before, a hitter needs to employ a flatter swing path at the top of the zone and a steeper one at the bottom. Sounds easy enough, but the tricky part is generating enough bat speed across a range of bat angles to make it work from a damage perspective while maintaining the body control to make contact. What’s notable here is how Merrill does this: Unlike most hitters, Merrill keeps his bat vertically oriented against low and high pitches, which allows him create enough lift to shoot the gaps no matter the height of the pitch. It’s a balance of strength and finesse that Merrill seems to have mastered.

I could throw a bunch of numbers at you to explain this particular skill, but the best way to understand this is by watching what he does with his body and bat. Let’s take a look:

Upper Third

Before watching the lower third swings, here are a few quick notes. He maintains his posture and shoulder plane during all three of these swings. Because of that, he keeps his bat on the same vertical plane as these pitches so he can square up the bottom part of the baseball to create backspin but not get so far under it that he pops them up. Also, his torso backbend on the second swing is fantastic. This move is most noticeable from a hitter like Shohei Ohtani, who right before contact bends his upper body backward to give his barrel space to get behind the ball. Few hitters have the necessary upper body or t-spine flexibility to do this; Merrill is one of them. Okay, now onto some swings in the lower third:

Lower Third

Pay attention to his back shoulder on each of these swings. Merrill’s body and bat are moving together as he swings, and he uses his back shoulder as a guide to get his barrel on plane with pitches in the lower third. Whether it’s a back-foot breaking ball or a dotted heater away, his back shoulder angle lines up his swing.

The important thing to take away from all of this is Merrill has a great understanding of how to use his upper body to get his bat on plane with pitches at different heights. That’s the elite skill carrying his game right now. He has the talent to develop additional tools and sharpen the ones he currently owns as he gains more experience. He’s already started tapping into his power more over the last month or so. He still chases too many pitches and struggles against lefties, albeit in a small sample of plate appearances (70 wRC+, 127 PA), but again, he is 21 and figuring things out in his first big league season. What we’re seeing from him right now is essentially his starting point as a hitter, and that’s really exciting.

The smooth, lefty stroke has aged like fine wine through baseball history. Ben Rice is one of the latest examples of a left-handed hitter whose swing alone makes him fun to watch. Moving through the Yankees’ system as a bat-first catcher, Rice’s explosive minor league performance the last year forced his name into the big league conversation when first baseman Anthony Rizzo landed on the injured list with a fractured arm.

Even before Rizzo went down, Rice was mixing in more time at first base at Triple-A this season. That’s where the organizational need was, and his skills were not quite suited long-term at catcher anyway. As you’d expect, his defense at his new position has been a work in progress, and the same is true for the rest of his game. At the plate, Rice is experiencing the same ups and downs that most rookies do: Pitchers are figuring out how best to attack him, and he is learning how to make adjustments at the big league level.

With a 102 wRC+ over 142 plate appearances, Rice has been formidable thus far, but much of that is due to his hot streak that came along with his call-up. Across his first 19 games, he slashed .267/.348/.567 with five home runs, including the three against the Red Sox on July 6, and a 154 wRC+ over 69 plate appearances. During his 18 games (73 PA) since then, he’s batting .143/.247/.283 with two homers and a 53 wRC+. Despite that recent skid, ZiPS still believes in Rice, giving him a projected 110 wRC+ for the rest of the season. No projections come without uncertainty, of course, but there is a reason why ZiPS – and other projection systems – are confident the under-the-radar prospect can continue to be above average at the plate. Let’s get into it. Read the rest of this entry »