Every winter, pitchers step off the mound and into the lab. Sure, not every pitcher is in a wind tunnel with a high speed camera from October to January, but enough are that everyone seems to reap the benefits. You’ve got the sweeper, the kick change, the rise of the splitter, new fastball shapes – you name it, someone has tried it recently. That means that every year, I spend the first month or two of the season catching up to the new hot thing going on in the world of pitching.

But I have to level with you: On the whole, things haven’t changed as much this year as I expected. That won’t stop me from walking through what has changed, though, and the first shift to highlight is a subtle one – we’re seeing more bendy sliders and fewer gyro offerings:

Why? Two things are happening. First, sweeping sliders do better against same-handed batters, so pitchers are choosing that as their secondary of choice when they have the platoon advantage. In 2021, 2.6% of pitches that righties threw to righties were sweepers. In 2025, that number has ballooned to 10.7%; it’s 10.9% for lefties against lefties. Usage is less than half as high when opposite-handed batters are at the plate.

Meanwhile, “regular” sliders are on the decline when pitchers have the platoon advantage. That makes good sense – they’re just throwing sweepers instead. And when pitchers aren’t facing same-handed batters, neither slider is particularly great; pitchers are staying away from both, more or less. That means that the traditional, gyro-spin slider is declining in prevalence overall. Read the rest of this entry »

Last year, Victor Scott II broke camp with the Cardinals behind an avalanche of buzz. He’d swiped 94 bags in the minors the previous year while playing elite defense in center field and posting a solid batting line. With the new rules providing a tailwind to speedsters, Scott seemed like the next exciting Cardinals position player. But then he hit the major leagues, or rather, didn’t hit in the major leagues. He batted .179/.219/.283 over 50 games of action and ended up down in Triple-A, a level he’d skipped during his meteoric rise, where he also struggled.

This year, Scott is back in the majors, but with considerably less hype surrounding him. However, a month into the season, he looks like a completely different hitter. He’s walking more, striking out less, and hitting for a higher average thanks to more line drives. He’s also living up to his potential on the basepaths and in the field, with a perfect 9-for-9 stolen base record and good defense. Last year’s version of Scott? Unplayable. This year? A fun upgrade on Kevin Kiermaier. Could the new version possibly be here to stay? I dug into the numbers to hazard a guess.

The main thing I’m interested in when it comes to Scott is how he gets on base. That’s what makes him intriguing – once he’s on first, he’s basically on second. Since you can’t steal first, that’s where the pinch point is. And in 2024, pitchers had a simple plan: Attack the zone and dare Scott to do anything about it. That helps explain his 3.9% walk rate – he got to a 1-0 count in about a third of his plate appearances last year. Similarly, he reached two or more balls in a count only about a third of the time.

There are major league players who succeed despite working from behind in the count so frequently, but they tend to have an elite compensatory skill. I’m talking about Luis Arraez’s contact, Jake Burger’s power, Bo Bichette’s feel to hit. Honestly, most hitters who get ahead in the count and walk so rarely just aren’t good. Pitchers don’t let them get into advantageous counts; the group is dotted with low-power defensive specialists who pitchers simply don’t respect.
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Welcome to another edition of Five Things I Liked (Or Didn’t Like) This Week. Normally, this column is a celebration of the extreme athleticism and talent on display across the majors. This week, though, I found myself drawn to the oddities instead. Unhittable 98-mph splinkers? Boring. Let’s talk about a pitcher who can’t strike anyone out and yet still gets results. Some of the fastest human beings on the planet stealing bases? I’d prefer some slower, larger guys getting in on the act. Brilliant, unbelievable outfield catches? I was more fascinated by a play that didn’t get made. The only thing that hasn’t changed? Mike Trout still isn’t to be trifled with. So thanks to Zach Lowe of The Ringer for his incredible idea for a sports column, and let’s get down to business.

1. In-Game Adjustments
In the 15th year of his career, Mike Trout doesn’t stand out the way he did early on. He’s no longer the fastest and strongest player every time he takes the field; he’s more “slugging corner guy” than “perennial MVP frontrunner” these days. But one thing hasn’t changed: Trout’s wonderful ability to adapt.

Landen Roupp faced the Angels last Saturday, and he leaned on his curveball. He always does, to be fair. It’s one of the best curveballs in baseball, with enormous two-plane break, and he throws it 40% of the time, more than any of his other pitches. In fact, he throws his curveball more often than any other starting pitcher. Trout had never faced Roupp before, and so he struggled to deal with the signature offering.
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Joe Ross had a bummer of a 2024 season – a lower back injury ended his season after only 74 innings. He had a bummer of a start to 2025, too. Opponents were hitting him hard and he couldn’t miss a bat to save his life. But Tuesday night against the Mets, manager Rob Thomson said, Hey Joe, I trust you.

Ross was in the game unexpectedly early after Cristopher Sánchez departed with forearm soreness after only two innings. Ross came in to start the third inning, with the Phillies trailing 2-1. He came out of spring training in a short-relief role, but more recently he’d been used as a long reliever, and this particular situation called for multiple innings. So Ross came in and looked great, the best he has all year. After Pete Alonso greeted him with a single, Ross retired the next six Mets in order, two on strikeouts.

Two innings matched Ross’s longest outing of the year, and his pitch count was already up to a season-high 32. How long would you stick with a reliever who began the day with a 7.45 ERA, a 5.30 FIP, and an 11.1% strikeout rate in a one-run game? At some point, Thomson would have to take him out, and the bottom of the fifth inning seemed like the perfect time. The top of the Mets order was due up, which meant Francisco Lindor. And Francisco Lindor owns Joe Ross.
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This season is the third since the implementation of a spate of significant rule changes across the majors. Along with a pitch clock and limits on defensive positioning, a limit on disengagements (read: pickoff throws plus idle standing around) combined with slightly larger bases gave runners a collective green light. With fewer throws to first, bigger targets to slide into, and more predictable pitcher deliveries thanks to the clock, stealing a base got much easier overnight. In 2022, the last year of the old rules, the majors saw 2,486 steals across the entire season. In 2024, that number surged to 3,617 steals. Even better from an offensive perspective, the stolen base success rate jumped from 75.4% to 79% over that span.

The first year of the new rules was all about experimentation. Some players ran wild – Ronald Acuña Jr. more or less took off every time he could. Meanwhile, the Giants stole just 57 bases as a team, fewer thefts than the previous year, when those steal-boosting rules weren’t yet in effect. None of that seems particularly surprising to me; when new rules of this import are added to the game, every team will scramble to figure out how to change their own behavior to benefit. There were a ton of moving parts, and many teams took a simple approach: keep stealing more and more until it starts to fail.

The 2024 season was the year of the defensive reaction. Teams attempted 209 more steals in 2024 than they did in 2023, but only succeeded on 114 of those extra steals. The aggregate effect was a lower success rate on marginally more attempts. Catcher pop times improved, pitchers threw over more often, and defenses were more attentive to baserunners in general. That brings us to 2025, and in the early going, it looks like the baserunners are continuing to push the envelope:

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Hello there, FanGraphs readers. Today I’d like to tell you about a reliever on the Los Angeles Angels. Now sure, just last week, I wrote about how much help the Angels needed on the pitching front, and in the bullpen in particular. And sure, the guy we’ll be discussing today has a 4.05 ERA and a 4.08 FIP so far this year, not exactly stud closer numbers. Was he a trade throw-in last summer, one of four lottery tickets the Angels landed in exchange for a reliever in a contract year? He sure was. But that doesn’t change the fact that he’s interesting. So I’d like to introduce you to Ryan Zeferjahn, the best reliever you’ve probably never heard of.

The first thing you should know about Zeferjahn is that his primary pitch is weird. Everyone calls it a cutter, and in many ways, that makes sense. Let me show it to you in action:

Yep, that’s a cutter. It’s 90-ish mph, with less rise and arm-side fade than a four-seam fastball, and it makes batters look uncomfortable because they can’t quite classify whether it’s a fastball or a breaking ball. Miguel Vargas read that pitch as inside, and then it held the plate thanks to unexpected cut. But Zeferjahn’s cutter has, for lack of a better way of saying it, a lot of cut even for a cutter. This isn’t something you would pick up from watching a GIF or two, but that pitch has about six inches of glove-side break. Read the rest of this entry »

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Welcome to another edition of Five Things I Liked (Or Didn’t Like) This Week. There must have been something in the water across the league over the past seven days, because while this column always highlights delightful oddities that I caught, they aren’t often so delightful or so odd. This week, rarities abounded. There were runners getting hit by throws, wild acrobatics, no-look passes, and even a pitchout. Hot teams and cold teams clashed, errors got compounded, and situations that felt in hand rapidly got away. So keep an eye on the runner at first base, and let’s get started – after my customary thanks to Zach Lowe of The Ringer, who popularized this column format for basketball.

1. Not-Quite-Free Bases
Jarren Duran is off to a slow start to the 2025 season. And while the problems have mostly come at the plate, everything seems a little off. Take this misadventure on the basepaths last Thursday. Duran led off the bottom of the 10th inning with a game-tying single. That made him the winning run, and he immediately started plotting a theft of second base to get into scoring position. Nick Sandlin checked on him:

Then he checked on him again:

That’s two disengagements; Sandlin wasn’t likely to try again. Duran stole 34 bases last year. He’s blazing fast. He was 5-for-5 on the season and had already swiped one in this game. Second base was as good as his. And so the Blue Jays took extreme measures, calling for one of the least-used plays in modern baseball, a pitchout:

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It’s never fun being the subject of a story that people call a saga. So when the Pete Alonso free agency saga transpired over the winter, I wondered whether he’d get off to a sluggish start as a result. Signing for less money than your agent told you you’d make, later than you expected to sign, and with a team offering you a smaller contract than they had the year before? It’s enough to make spring training a bit less of a ramp-up period and a bit more of a time for taking out frustration. If Alonso had started slow this season, I wouldn’t have raised an eyebrow.

Turns out, Pete Alonso isn’t like me. Instead of sulking a little and coasting into the regular season, he’s come out like a man possessed. Through Tuesday’s action (17 games), he’s hitting an outrageous .356/.466/.729, the kind of batting line that doesn’t really make any sense and doesn’t need to. Suffice it to say, he’s not going to stay this hot unless he’s secretly Lou Gehrig, a development that would raise more questions than it answered. So we don’t need to ask whether this form is real – we can instead focus on what Alonso is doing the same and differently, and then go from there.

What is Alonso best at? That’s right, hitting the ball in the air with authority. That’s always been his calling card and it’s no different this year. Want a simple way of stating that? He leads the majors with 13 barrels, one ahead of Aaron Judge. That’s the kind of power you’d expect from a first baseman who averages 38 homers per 600 plate appearances (2020 makes “per year” stats pretty annoying). Even last season, Alonso’s worst in the bigs, he finished 13th in the majors in barrels. He plays a lot and he hits the ball very hard; those are things we’ve always known about Alonso. Read the rest of this entry »