Ceddanne Rafaela has a weak arm. He also has a strong arm.

This is an analysis I’ve wanted to do for a while. It’s not that important or complicated, and most of it is fairly obvious. But it gets at something that comes up from time to time in the various places baseball is discussed online. The conversation tends to start like this: Team A should sign Player X and move him to a new position. Inevitably, one of the first questions asked about such a plan is whether Player X has the arm strength to play that new position.

The number that gets cited to “yay” or “nay” such a follow-up is arm strength, in miles per hour. But ask any baseball fan to sit with this for a moment, and they’ll raise a concern. Arm strength, to some degree, is a function of position. A third baseman has a longer throw to make than a second baseman. A right fielder has a longer throw to make than a left fielder. This means players with better arms tend to play those positions, as we can see in this plot:

Read the rest of this entry »

Luke Raley took a big hack. Then he took another.

Raley has struck out 36.6% of the time to begin 2026, third most among batters with at least 100 plate appearances. He’s walked just 5.9% of the time, well below the median. His 0.16 K/BB ratio is one of the 10 worst in baseball this year. That’s typically not a recipe for success.

But this is:

Raley has six homers so far in 2026, carrying him to a 132 wRC+. He’s hitting the ball hard (51.8%), to the pull side (50.0%), and in the air (60.7%). His .595 xwOBA on contact is third in the majors. The only batters who have made better contact are Aaron Judge and James Wood, putting Raley ahead of Ben Rice, Munetaka Murakami, Mike Trout, and Yordan Alvarez. It’s impressive company to keep. Read the rest of this entry »

The best team in baseball will be without its biggest star for a few weeks.

The Braves placed Ronald Acuña Jr. on the injured list Sunday with a strained left hamstring. Acuña exited Saturday’s game after pulling up in considerable pain while running out a groundout. Manager Walt Weiss told reporters that imaging revealed a Grade 1 strain, the least severe grade. According to MLB.com, Weiss said:

“It’s not going to be just a couple days. It’s gonna be more than that, so we need to put him on the IL, and hopefully it’ll be sooner than later. No idea with these soft tissue injuries how long they’re gonna take, but I think the silver lining is that the MRI showed it wasn’t too serious.”

While many players return from Grade 1 hamstring strains in just a couple weeks, or even following the 10-day minimum, this is an injury that can linger and delay a return.

This is, obviously, less than ideal for the Braves. Acuña is their best player and was projected in the preseason as the ninth-best position player in baseball with 5.4 WAR, according to our Depth Charts. Though his performance hasn’t been spectacular thus far, with a 111 wRC+ in 152 plate appearances, his .381 xwOBA and 12.2% barrel rate — along with strong strikeout and walk rates — suggest he hasn’t missed a beat this year, coming off his bounce-back 2025 season.

Of course, last year was a comeback campaign because Acuña missed most 2024 (and the early part of 2025) after tearing his ACL. He also missed chunks of 2021 and 2022 with a torn ACL in his other knee. In 2018, he missed about a month with a mild ACL sprain. That means Acuña’s hamstring strain is his fourth lower body injury requiring IL time in his career. Read the rest of this entry »

It’s not obvious why Landen Roupp is good, but it’s probably time to find out.

Roupp’s 2.54 xERA is seventh among qualified starting pitchers. He’s striking out batters, getting groundballs, and working deep into games. He’s tied for 15th in the majors with 0.9 WAR. That’s about 70% of what he was projected for by FanGraphs Depth Charts in the preseason. It’s one of the most surprising performances of April.

Most pitchers “get good” because they miss bats, or attack the zone, or both. That doesn’t apply to Roupp this year. His 25.1% whiff rate is about the median among qualified pitchers, and his 37.1% zone rate is bottom five. Frankly, he doesn’t throw a ton of strikes.

The underlying “stuff” metrics aren’t any more impressive.

Roupp doesn’t throw particularly hard, or display outlier movement, or place near the top of any leaderboard I know to check. And yet, he excels. Where is all that value coming from? Read the rest of this entry »

The Washington Nationals are starting out strong, but not strong enough.

They weren’t supposed to be good in 2026. They weren’t good last year, or the year before, or the year before, or the — they haven’t been good since they won the World Series in 2019. Our preseason positional power rankings had them 29th by overall projected WAR. Justin Klugh led the Nationals essay in the 2026 Baseball Prospectus annual with the story of an enema given to George Washington just before his death. And no, the parallel was not a particularly happy one.

Indeed, the Nationals have not been good. They’re 11-15 with a -18 run differential and a bottom-five WAR. They’re not yet last in the NL East because of whatever is going on in New York and Philadelphia. But our projections assume they’ll find their way there eventually.

Still, it’s the way they’ve gotten to “not good” that’s been frustrating, entertaining, and perhaps even a bit encouraging. Let’s start with a plot: Read the rest of this entry »

Only an act of science could get Jeremiah Jackson to take a walk.

Jackson entered Sunday with 65 plate appearances in 2026. He’d picked up 19 hits, including five homers and a double. He’d also struck out 17 times, grounded into two double plays, lined a sacrifice fly, and taken a wayward breaking ball off his back toe. He’d worked through pretty much every standard outcome for a plate appearance to begin the new season — but he hadn’t drawn a walk. In fact, Jackson entered Sunday as the batter with the most plate appearances in the majors to have not recorded a base on balls.

That was initially the case again Sunday as the Orioles wrapped up their series in Cleveland. Jackson struck out in the second inning, hit a sharp line drive single in the fourth, and reached on an error in the fifth.

Then he stepped to the plate to lead off the eighth. On the mound was nasty lefty Erik Sabrowski, fresh out of the Guardians bullpen. Sabrowski started him with a big curveball in the dirt. Jackson laid off for ball one. Sabrowski pumped his signature fastball, but it ran too far inside for ball two. Sabrowski tried to skim the other side of the plate, but missed too high for ball three.

Then it happened. Sabrowski threw another fastball, this time over the center of the plate. But he again missed too high — way too high — for ball four. Jackson had drawn his first walk of 2026.

Except, he hadn’t. Just as Jackson was prepared to set his bat down, the umpire called strike. Jackson paused, tapped his head, and proceeded with setting down his bat and removing his equipment, with a curious eye toward the video board. In zoomed the animated ball, revealing that the pitch was indeed way up and out of the zone for ball four. Jackson walked to first. Read the rest of this entry »

Most players grow up, not out.

When I wrote about Julio Rodríguez a few weeks ago, one of the points I made was that he has a “not-so-distant” shot at being the best player of Generation Z. My wording was intentional, a careful hedge illustrated by this plot:

The plot shows Rodríguez was the best player among Gen Z through his first two seasons and the second best through four seasons, behind only Bobby Witt Jr. This is a lie of omission. Rodríguez debuted when he was 21, and Witt debuted when he was 22; the plot compares them to Ronald Acuña Jr. and Fernando Tatis Jr., who each debuted when they were 20, and Juan Soto, who debuted at 19. Read the rest of this entry »

Randy Vásquez has struck out 19 batters in his first three starts of 2026. He didn’t record his 19th strikeout in 2025 until May 14, in the third inning of his ninth start.

Vásquez has simply dominated in the earliest days of the new season. He opened the year with six shutout innings against the Tigers, striking out eight. He picked up a mere three strikeouts in his second start against the Red Sox, but his stuff was just as good, generating whiffs on 32.6% of swings. And then he picked up eight more strikeouts on Thursday against the Rockies. He now has a 1.02 ERA, a 2.57 FIP, a 27.5% strikeout rate and a 5.8% walk rate, pitching like a top 20 starter in the majors to begin 2026.

Weird, right?

It’s not that Vásquez was terrible before this year. He posted a 3.70 ERA and 4.96 FIP across 26 starts in 2025, and his performance was similar in the two seasons prior. That’s a pitcher who can stick in the backend of most rotations and serve as useful depth. But it wasn’t clear what Vásquez did well, or how he might take the next step to becoming a true mainstay in the majors. He walked more batters than average. He didn’t really limit hard contact. And his 14.8% strikeout rate was the lowest among any starting pitcher with at least 200 innings from 2023 through 2025. He was just kind of there. Read the rest of this entry »

Batters swing slower in the cold, but I’m not sure that it matters.

Bat speed goes down when it’s cold, and it goes up when it’s hot. This is something that’s both literally true and curiously linear. We can see in the plot below that bat speed climbs bit by bit as temperature rises from chilly to toasty:

My first thought is this makes sense. It’s reasonable to assume batters don’t swing as fast when their muscles are stiff and their hands are numb. I’ve been cold before, and yeah, it’s difficult to perform tasks requiring fine motor skills.

My second thought is I’m skeptical. Notice the scale of the plot. All that movement amounts to about 0.6 mph from the coldest games to the warmest games. Lots of things other than temperature could be driving this relationship. Bat speed goes down with velocity. Velocity goes up with relievers. Relievers enter games late. Temperature goes down at night. You can see how this could get tricky.

Let’s build a model. Read the rest of this entry »

The Blue Jays have lost another key player to injury.

Alejandro Kirk left Friday’s game against the White Sox in the 10th inning after a foul tip glanced off his glove hand. He immediately dropped his glove, grabbed his thumb, and hustled into the clubhouse with trainers. The team after the game announced Kirk had fractured his thumb. No timeline for a return was given. Our injury log suggests batters with thumb fractures typically return in about four to eight weeks, although Kirk fractured the thumb on his catching hand, which could require a longer recovery.

It’s the latest significant injury for the reigning AL champs, who lost Cody Ponce last week while fielding a grounder in his first start in the majors since 2021. Trey Yesavage, José Berríos, and Shane Bieber are on the injured list, as well, though each is in the “throwing” process of his rehab. Read the rest of this entry »