Just a few weeks ago, Julian Merryweather was fighting for a spot on the Blue Jays Opening Day roster. A back injury suffered early in spring training pushed his Grapefruit League debut back to mid-March and he struggled to get up to speed in such a compressed timeframe. But then Kirby Yates went down with an elbow injury that would require Tommy John, a couple of other pitchers were sidelined to start the season, and Merryweather just barely snuck onto Toronto’s 26-man roster on March 31.

The very next day, he was pitching in the 10th inning in Yankee Stadium, trying to hold a one-run lead on Opening Day. He came one pitch away from throwing an immaculate inning and ended up striking out the side to secure the win. Three days later, he was thrown into the fire again, this time being asked to protect a two-run lead in the bottom of the ninth. He recorded two more strikeouts in that outing and earned the second save of his career.

When I wrote about what the Blue Jays bullpen might look like without Yates a few weeks ago, Merryweather wasn’t even on my radar. Jordan Romano and Rafael Dolis have definitely been in the mix for high-leverage work — they threw in the eighth and ninth of that Opening Day victory paving the way for Merryweather’s appearance in the 10th. The quality of Merryweather’s stuff has been a revelation and has helped him emphatically declare his spot in the bullpen pecking order.

Merryweather was acquired by the Blue Jays in August of 2018 when Toronto traded Josh Donaldson to Cleveland right before the waiver trade deadline. It was viewed as a light return at the time since Merryweather had blown out his arm during the previous season and was in the middle of rehabbing from Tommy John surgery. He got back on the mound in 2019 but another arm injury limited him to just six minor league innings. Last season, he made his major league debut in September, showing impressive velocity and a starter’s repertoire out of the bullpen, but another elbow issue cut his season short after just 13 innings. Read the rest of this entry »

This is Carmen’s first piece as a FanGraphs contributor. Carmen is an engineer living in the Bay Area. Born and raised in Connecticut, his inherited Yankees fandom (yes, he can hear all of your grumbles) and curiosity about math and science combined to foster a fascination with how players contribute to run scoring and prevention, as did growing up reading the venerable pages of sabermetric havens such as FanGraphs, Baseball Prospectus, and Beyond the Boxscore. The accessibility of pitch-by-pitch Statcast data has allowed him to dig deeper into player and team tendencies and examine how each approaches the opposition, which he has written about at his own website, Sabermetric Musings. He hopes to use his skills and interests to contribute to the baseball discourse at large, as well as the website that played such a big part in making him the baseball observer he is today.

Vladimir Guerrero Jr. is a supremely talented hitter. In this season’s early going, he has already hit a ball 114.1 mph, swatted a home run, and has a couple of RBI to his name. Prior to his call-up in 2019, Eric Longenhagen and Kiley McDaniel rated him as the best prospect in baseball with a 70 Future Value. If you go to The Board, only five other players since 2017 have received such a grade: Wander Franco (now an 80), MacKenzie Gore, Gavin Lux, Yoán Moncada, and Shohei Ohtani. His specific combination of future tool grades, consisting of a 70 hit tool, 70 game power, and 80 raw power, is unrivaled in the dataset, a unique blend of elite bat-to-ball skills and game-changing power. At 19, he posted a 203 wRC+ in Double-A and a 175 wRC+ in Triple-A. The latter is especially impressive given that the average age of a Triple-A player is 28.

With those things in mind, you might say that what we have seen from the young phenom thus far is a bit disappointing. In 757 plate appearances through his age-21 season, Guerrero has posted a 107 wRC+. That places him 112th amongst all hitters since 2019 (for players with at least 500 plate appearances), sandwiched between the aging Robinson Canó and Omar Narváez. But I would note that context is key. Guerrero is one of only 10 players to receive 500 plate appearances through age 21. On that list, he ranks seventh in wRC+ behind Juan Soto, Fernando Tatis Jr., Cody Bellinger, Ronald Acuña Jr., and Carlos Correa. One could argue that four of those guys are on a Hall of Fame trajectory while the fifth (Correa) has been one of the top talents in the sport when he is not struggling with injury.

Guerrero is in rare company given the amount of big-league time he has logged at such a young age; that is an accomplishment in and of itself. But we are still left wanting more. How can he unlock his generational tools and become the hitter we hope he can be? I would argue the most glaring potential adjustment is to his swing plane. In 2019 and ’20, Guerrero posted groundball rates of 50.4% and 54.6%, respectively. The following represents his rolling average groundball rate in 25 groundball samples:

A whopping 68.5% of these samples yielded groundball rates above the major league average. Over the past two seasons, major league hitters have produced a .218 wOBA and .244 BABIP on groundballs compared to a .500 wOBA and .344 BABIP on batted balls in the air. Among the group of players with 500 plate appearances the past two seasons, Guerrero ranks 15th out of 226 players in the cohort. The frustrating part of this phenomenon is that he hits the ball exceptionally hard, to the point where if he put the ball in the air at closer to league average rates he would be a candidate to place amongst the league leaders in home runs and overall production.

To get a better idea of how Guerrero compares to sluggers with his prodigious power, I pulled the batted ball data from Baseball Savant (via Bill Petti’s baseballR package) for a select few right-handed hitters who posted comparable maximum exit velocities to Guerrero in ’19 and 2020. This list includes the following:

Max exit velocity is our best indication of a player’s raw power. We do not have to worry about a sufficient sample of plate appearances to see how that power plays in the game; all we care about is how hard the player can put the ball in play if he makes optimal contact. You, the reader, might gripe that it is difficult to use max exit velocity to gauge a player’s power. How do we know this is truly the hardest he can hit the ball? To that I say, yes, smart reader we definitely do not know if a player’s maximum exit velocity is actually the hardest he will hit the ball. But, I will say, we can reasonably confident that we are in range fairly quickly, based on research from Alex Chamberlain.

The main comparison I am interested in is the differences in approximate attack angle between these players. The concept was outlined in great detail by Jason Ochart at Driveline in this 2018 post, but the TLDR is it is the vertical angle (which is associated with the launch angle of a batted ball) of the bat as it goes to impact the baseball. Hitters can measure it with bat sensors or by parsing video.

Unfortunately, we do not have this information for major league hitters in games because they do not walk up to the plate with sensors on their bats. Instead of throwing our collective hands up, however, we can approximate attack angle with the data we do have access to. And fortunately, that has already been done. Back in 2017, David Marshall wrote an amazing piece on the Community Research blog here at FanGraphs reverse engineering attack angle from Statcast data. He concluded his post with an elegant linear equation approximating attack angle based on the launch angle of the top 20% of a player’s hardest hit batted balls. Anthony Shattell has also posted about data of this nature in the past, and I would highly-recommend scrolling through his feed for some batted ball related visuals; he uses the top 10% of hardest hit balls for his attack angle approximations. For this analysis, I arbitrarily took the top 5%. One might quibble with such a choice, but I think it gets the same point across.

Here are the estimated attack angles for the hitters in the table above based on my filtering criteria:

Stanton has the flattest swing in this group with an estimated attack angle of 8.74 degrees. Guerrero is even lower at 8.71 degrees. Stanton and Judge stick out in that they hit a ton of home runs but have noticeably flatter swings then the rest of the group. They make up for those flat swings by hitting the ball harder than anybody else in baseball. In the Statcast era (since 2015), Stanton has hit 28 balls over 118 mph, the most in the majors. Judge sits second with 10 (he was not a full-time regular until 2017). Third, despite his lack of experience in the big leagues, is Guerrero. If you just look at 2019 and ’20, Vlad is tied for the most with Stanton. Guerrero and his power are in rare company. What’s more, Stanton and Judge have career strikeout rates of 28.1% and 31.4%. Guerrero’s sits at just 17.0%. Even though he doesn’t have quite the same amount of juice on contact as the Yankees outfielders, he makes up for it by putting the ball in play much more often, albeit on the ground. Stanton and Judge have career groundball rates of 42.2% and 38.5%, respectively, with the former about league average and the latter about a standard deviation below it.

Guerrero is still a step behind Stanton and Judge with regards to power, so any large increase in extra base hits (where he has been slightly above league average in terms of the percentage of his total plate appearances) will have to come from either hitting the ball harder or putting more balls in the air. In my own research, I found that maximum exit velocity peaks around age 26 and average exit velocity on balls in the air peaks around 30. So maybe there is some power Guerrero can still squeeze out of his bat. Given that he is already inside the top 1% in raw power, however, I am dubious of how much room for growth there is in that department. What about swing plane? There is precedence for young hitters changing their distribution of batted balls.

More often than not, these young talented hitters saw performance boosts when putting the ball in the air more. That is not to say Guerrero will definitely see a bump in production if he focuses on hitting the ball in the air. It could mess with his swing for all I know. But I do believe that there is room for him to add some loft in his swing, even at the expense of more whiffs. His strikeout rate is close to six percentage points below the league average. There is a trade-off to be had there that can make him the fearsome hitter we all believe he can be.

Guerrero is still very young and has a lot of room to grow as a hitter. The projection systems seem to agree. The FanGraphs Depth Charts projections see him putting up a .360 wOBA in 2021, 23rd in baseball. THE BAT X, which to my knowledge most explicitly leverages existing Statcast data, is even more optimistic. It sees a .376 wOBA in Vlad’s future, placing him 11th in the league and sandwiching him in between Yordan Alvarez and Judge.

When you consider his pedigree coming into the majors, his high-end bat control (as evidenced by his strikeout rate), and his nearly unmatched power, I still think these projection systems are a little light on what to expect from Vlad Jr. going forward. His combination of skills should put him in the conversation to be among the best hitters in baseball, the type who is in the MVP conversation throughout his 20s. Let’s hope he can make the necessary adjustments and grow into that kind of player starting this season.

If you had Jonathan Lucroy driving in the first runs of the Nationals’ 2021 season, take your ticket to the window and claim your winnings. Due to a COVID-19 outbreak that forced the team to sideline nine players, the 34-year-old backstop, who was unemployed as of last week, suddenly became Max Scherzer’s batterymate for the Nationals’ season opener against the Braves. Things didn’t go well at the outset, but in his first major league plate appearance in about a year and a half, Lucroy helped the Nationals’ ace dig out of an early 3-0 hole with a two-run double.

In their first game in front of fans since winning the 2019 World Series — albeit just 4,801 fans, with Nationals Park only allowed to be filled to about 12% capacity — the Nationals completed a dramatic comeback via Juan Soto’s walk-off single in the ninth for a belated Opening Day win under very strange circumstances.

The situation was the culmination of a sequence of events that served to remind Major League Baseball that yes, there’s still a pandemic going on. Despite just 25 players out of a total of more than 2,000 testing positive for COVID-19 either on intake or during spring training, MLB made it exactly zero days into the regular season before having to deal with its first outbreak. The marquee Opening Day matchup between Scherzer and the Met’s Jacob deGrom was postponed after the test of a Washington player from Monday, the final day of spring training, came back positive. The remainder of the three-game series was scrubbed once the total number of positives climbed to four, with nine other players quarantined following contact tracing. Read the rest of this entry »

Joey Gallo is a walking archetype. You know the rough outlines: strikeouts like you wouldn’t believe, gobsmacking power, and the walks that accompany those two. When he’s good, he’s blasting his way to success; the park almost doesn’t matter when he gets into one, so titanic is his power.

If you knew only that about Gallo — and to be clear, it’s the most important thing — what would you think about his BABIP? It could be sky-high; he whiffs quite a lot, but that doesn’t matter for BABIP, and when he makes contact, it’s the loudest contact there is. He’s barreled up a fifth of his batted balls, and hit 50% of them 95 mph or harder. That makes it easier to find a hole — or make one.

It could be low, though! Many of those hard hit balls leave the park. What might be doubles in the gap or smoked line drive singles for another player might be home runs for Gallo, and singles and doubles are the bedrock of BABIP. Grounders and pop ups are no good; the real juice is in line drives and low fly balls, and he might simply hit his too hard to keep them in the field of play.

The answer is depressingly pedestrian. Gallo’s career BABIP stood at .270 entering this year, below average but not atrocious. That’s 40th-worst in baseball over that time period, in the same general area as many homer-happy sluggers. Mike Moustakas, Kyle Schwarber, Rhys Hoskins, Chris Davis — basically, hitters who get a disproportionate amount of their value by putting the ball in the air and over the fence. Read the rest of this entry »

You can see, if you want, the teenager who signed with the Minnesota Twins in 2016: a second-round pick from Salem High School in Georgia, leaving an offer from the University of Kentucky to make a go of it in the minors. You can see, in fact, his pre-draft workout for the Twins. It’s right here on YouTube, with a modest thousand views: not the best quality, not the best angle, but he’s there, swinging away, his face turned away from the camera. The video was uploaded by John Baddoo, his dad, whose channel features just one other video — again, starring his son Akil, this time going up to bat in Puerto Rico. From behind the dugout in the sparsely-populated stands — so far that, at first, it’s unclear who is being filmed — the phone camera slowly focuses on Akil as he takes his warm-up swings. Its shaky zoom follows him to the plate. When he puts the ball in play, the video ends abruptly. We don’t know what happened to that ball, whether it was a hit or an out, but it doesn’t matter: We saw his patience, his swing. When this video was uploaded in 2015, he was only 17 years old.

Now, Akil Baddoo is 22. He is, as of last week, a major leaguer. And his debut week has been unlike any other. He made his first appearance on Sunday. His parents were there at Comerica Park, watching, just as they had been when their son was in high school. And on the very first pitch Baddoo saw in the majors, he homered.

That, in itself, is some incredible magic — of all the players who’ve debuted in the major leagues, a number that is currently approaching 20,000, only 31 have done what Baddoo did — seen one pitch and sent it out of the ballpark. But it didn’t stop there. The next day, Baddoo hit another home run: a grand slam, in fact. Read the rest of this entry »

This is Tess’ first piece as a FanGraphs contributor. She grew up playing youth baseball just outside of Oakland during the Moneyball Era, which sparked an early curiosity about the intersection of inclusion and innovation in the sport. With a master’s degree in Computing and Digital Media, she has worked for several years as a sports video editor, creating thousands of highlight videos for high school athletes with college ambitions. She is excited to apply her technical background to prospect evaluation and the amateur draft, and further explore the ways video and data continue to evolve baseball at every level. She lives in Chicago with her husband, dog, and cat.

Now that the regular season is upon us, spring training is starting to feel like something we all imagined. That’s true to an extent every season; the smaller stadiums and less familiar faces all dwell somewhere in the uncanny valley of what we recognize as professional baseball. But this year felt particularly dreamlike, with its ties and needless bottoms of the ninth. Despite these quirks, the Grapefruit and Cactus Leagues did provide the opportunity for several young pitching prospects to pitch their way onto major league rosters, solidify the roles they earned in 2020, or simply show fans what the future of their favorite club might look like.

I combed through Baseball Savant’s pitch velocities from the games played at Statcast-friendly spring training facilities and compared them to those recorded during the 2020 major league season. I then incorporated reports from last season’s alternate sites and other outside sources in order to understand what these spring velocities might mean for these prospects moving forward. So, before we forget the rolled innings that ended with fewer than three outs and convince ourselves that spring training was some sort of shared hallucination, let’s take a look at some of the guys who threw harder this past month and see what that might tell us about the season ahead.

Casey Mize entered the spring after a less than stellar debut season. In 2020, his ERA and FIP were both over 6.00, and he struggled with his command as he went 0-3 over six starts for Detroit. A brief look at his numbers coming out of camp might not reassure Tigers fans who focus their attention on his 7.23 ERA or the 11 walks he issued over 18.2 innings. But there is hope to be mined from Mize’s spring, especially in terms of the velocity he showcased. In 2020, Mize threw a total of 543 pitches, only five of which clocked in at 96 mph or faster, with his fastball averaging 93.7 mph. This spring, in his March 19 start against the Blue Jays alone, Mize topped 96 mph a whopping 37 times, more than half of his pitches thrown that day. Read the rest of this entry »

After Gary Sánchez’s rough 2020, there’s pretty much nowhere to go but up.

That was the rationale for including him among the 2021 ZiPS breakout candidates, with Dan Szymborski noting that no big league hitter — especially one with Sánchez’s power pedigree — carries a true-talent .159 BABIP. Unfortunately for the Yankees’ backstop, that’s how his batted ball luck shook out, with the shortened 60-game season preventing his BABIP from ever regressing to the mean.

Granted, Sánchez was not the only hitter to face extremely poor batted ball luck. A perusal of all players with at least 100 trips to the plate last season shows us that Sánchez only posted the fourth-lowest BABIP in the majors, with Hunter Renfroe (.141), Edwin Encarnación (.156), and Rougned Odor (.157) all worthy of taking even more issue with the BABIP Gods.

But even compared to these other tough luck seasons, Sánchez sticks out. What caused him as much trouble, if not more, was a lot of swinging and missing, something he did considerably more often than most of his peers in the bad BABIP department, with strikeouts in 36% of plate appearances. That combination of poor BABIP and a low propensity to put the ball in play resulted in a career-worst .147/.253/.365 triple slash.

Read the rest of this entry »

While José Berríos and Corbin Burnes were rightly grabbing everyone’s attention for their dueling no-hit bids on Saturday evening, Byron Buxton played the hero on the offensive side, producing the game’s first hit and first run via his seventh-inning solo homer. It was Buxton’s second game in a row with a homer, as he went yard on Opening Day as well, and even though he left Sunday’s game before he run his streak to third in a row — thankfully, not an injury, merely a “non-COVID related illness” — his start once again kindled hopes that the speedy center fielder can put together a full season worthy of his talents.

First, the pretty pictures. If you haven’t seen Buxton’s Opening Day home run off the Brewers’ Eric Yardley, it was a sight to behold, a towering shot that caromed off the American Family Field scoreboard:

The projected distance on that 111.4 mph blast was 456 feet, a career high that outdistanced his June 5, 2019 homer off Cleveland’s Tyler Olson by two feet. And once again, here’s Buxton’s homer off Burnes, which had a projected distance of 411 feet:

Read the rest of this entry »

The Padres used this past offseason to gear up in order to face the Dodgers on equal terms and end Los Angeles’ streak of division titles at eight. One key element in that plan is the presence of Fernando Tatis Jr., the team’s superstar shortstop, who the team recently inked to one of the richest deals in sports history — a 14-year, $340 million pact. But as the poet Robert Burns once wrote, the best-laid schemes of mice and men go oft awry; in this instance, a mighty swing through an Anthony DeSclafani knuckle-curve on Monday night, resulted in Tatis doubled over in pain on home plate.

Though there’s currently no word how much time Tatis may miss, any absence would be a blow to the Padres and to baseball, too, as he’s one of the sport’s brightest, most marketable young stars. It’s no fun for the owner of the troublesome left shoulder, either, particularly given how Padres manager Jayce Tingler described the injury after his team’s 3–2 loss to the Giants:

[It] comes out, comes back in, and so he’s been dealing with that, and obviously tonight, it was the first time we’ve kind of seen it in game action from swinging or anything like that. So, we’ll see how it goes tomorrow, but he’s going to get more tests tomorrow.

Tatis’ shoulder was acting up during the spring, so it would be hard to describe this as a completely isolated incident, though this is almost certainly the worst one. The injury has been diagnosed as a subluxation, which is a partial dislocation of the shoulder. The pain itself was clearly bad enough, but the larger problem is that the type of injury has a high rate of reoccurrence. While this condition isn’t necessarily traumatic or painful — one of my closest friends had a similar hip condition in high school, and it was only occasionally excruciating — it’s a bit of a problem for someone who makes his living swinging very hard at baseballs. Some experts in the field have already discussed, from afar, the possibility of surgery, which could endanger Tatis’ 2021 return. And while the prognosis is less bleak for hitters than it is for pitchers, shoulder injuries can be problematic long-term.

UPDATE: Padres general manager A.J. Preller announced before Tuesday’s game that Tatis would be placed on the injured list, but that surgery would not be required. Per The Athletic’s Dennis Lin, Preller said that Tatis has a slight labrum tear but that his physical exam was “pretty uneventful,” and that the team will go the “rest-and-rehab route” with the hope that Tatis is ready to return in 10 days.

The resulting consequences of Tatis’ injury are largely unknown at this point, as this happened just last night. But we can probably put some kind of bounds on it: He certainly won’t be in the game on Tuesday, nor did DeSclafani’s pitch literally retire him. Let’s first run some projections for the Padres, based on games through Monday evening, on the NL West both without the injury and in the worst-case scenario that Tatis misses the rest of the season.

The healthy projections are still quite close to the ones to begin the season. While a lot can happen in a week, both of the NL West front-runners have played solid but not spectacular baseball against the division’s lesser lights. The Dodgers have a slightly better position, but ZiPS already expected them to have a slightly better record, given that they opened the season with a four-game set against the Rockies, the computer’s pick for the worst team in the majors.

Losing about 15% of your division-winning scenarios is a significant setback, but Tatis is a terrific player, so this is to be expected. However, a projected worst-case scenario still leaves San Diego at 95 wins, the second-highest total in baseball. They’d win five of baseball’s six divisions with that total. Unfortunately, the division they play in is that sixth one.

I’m not sure it could be classified as good news, but San Diego’s depth mitigates the effect of the Tatis injury. The team has Jake Cronenworth, Ha-seong Kim, and Jurickson Profar available to cover the middle infield, a situation that many teams would be happy with as the Plan A. Imagine if the Padres had instead made no plans this offseason at shortstop, and the team was forced to go with replacement-level talent at the position.

A much worse plan B is enough to send the Padres down into the thick of the wild card race, to the extent that they’d have to fight with the Braves (at least in the projections) to get a guaranteed game at home in the playoffs. It’s even enough to get San Francisco’s divisional odds to round up to a non-zero number!

Other effects, such as loss of performance due to the shoulder problem, are a bit speculative at this stage. An injury like this is always unwelcome, but this is survivable for the Padres. But the best thing for San Diego and fans of baseball as a whole is for Tatis to return, swinging hard, and challenging for the NL MVP title. Even for Dodgers fans, wouldn’t it be more fun to beat your rivals when they’re at their best?

Velocity is all the rage these days, and why shouldn’t it be? It’s fun to see that third digit light up on a radar gun or show up on the scoreboard. And it’s happening more often than ever. From Opening Day through the weekend, eight pitchers combined for a total of 28 pitches over 100 mph, with Emmanuel Clase hitting the mark nine times out of the 11 cutting fastballs he threw on Sunday. It’s certainly exciting, but velocity isn’t everything. Yes, I want to know how hard someone is throwing when evaluating a pitcher, but my first question after that is what is the shape of the pitch?

A decade ago, scouts based their fastball grades almost entirely on velocity. Above-average velocity? Above-average fastball. But with the emergence of technologies like TrackMan, Hawkeye and Rapsodo, that one-to-one relationship has become a relic. There are pitchers who throw in the upper 90s who have average fastballs because of their shape and other intangibles; there are some with average velocity that are nonetheless plus pitches for the same reason. Because of this, the scouting scale has changed and is beginning to capture variables outside of just miles per hour. Some teams have begun asking their scouts to grade fastballs across three traits — velocity, movement and command. When I ran pro scouting with the Astros, I asked our scouts to capture velocity in their reports, but I wanted their fastball grade to reflect the effectiveness of the pitch in a more holistic way.

The best way to learn about fastball shape is first to think about what constitutes a normal shape. Sixto Sánchez has some of the best velocity in baseball, averaging a remarkable 98.5 mph with his four-seam fastball in 2020. It’s a plus pitch to be sure, but it also doesn’t play like you’d expect from a heater thrown 98-99 mph. Among the pitches in his arsenal, it’s the third most-likely to put away an opposing hitter, and it’s where he gives up his home runs. Why? Because in terms of fastball shape, it’s exceptionally normal. Here are Sánchez’s four-seam fastballs in 2020, as measured by horizontal and vertical movement:

I added a “line of normality” to show just that, as the 45-degree angle shows the normal amount of vertical and corresponding horizontal break on a fastball. As you can see, Sánchez’s four-seamer has just a smidge more rise (vertical) than run (horizontal), but for the most part, the cluster of pitches sits right on that line. These pitches are moving the way most fastballs move. More importantly, these pitches are moving the way hitters expect them to when they come out of his hand. The end result? A pitch that is easier to hit. Read the rest of this entry »