If motor preferences were the final word on pitcher performance, Nathan Eovaldi would be sitting on a beach somewhere.
Eovaldi throws from a low slot, releasing his pitches from an average arm angle of 30 degrees. (Zero degrees is fully sidearm; 90 degrees is straight over the top.) Many low-slot pitchers have a supination bias. There are downsides to being a supinator — their preference for cutting the baseball tends to produce crummy four-seam fastballs — but they usually have no trouble throwing hard breaking balls; they can also more easily harness seam-shifted wake to throw sinkers, sweepers, or kick-changes. Low-slot supinators, like Seth Lugo, can basically throw every pitch in the book. High-slot pronators like Ryan Pepiot or Lucas Giolito don’t have that sort of range, but make up for it with excellent changeups and high-carry fastballs.
Eovaldi is, tragically, a low-slot pronator. Not many low-slot pronators make it to the big leagues. The pronation bias blunts their ability to throw hard glove-side breakers, and the low arm angle obviates the pronator’s nominal advantage, killing the carry on their fastball. As Tyler Zombro of Tread Athletics (now a special assistant of pitching for the Cubs) said in his primer video on motor preferences, “I know in stuff models and just off of Trackman alone, this arsenal with this slot is not that attractive.” Read the rest of this entry »
Marcus Semien was a promising prospect heading into the 2013 season, but he was far from a high-profile player. When that year’s Baseball America Prospect Handbook was published, the 2011 sixth-round pick out of the University of California-Berkeley was ranked just 14th in a light Chicago White Sox system. (At the time, in-depth scouting reports were still in their nascent stages here at FanGraphs.)
In the 12 years since then, the 34-year-old Semien has gone on to exceed those modest expectations. He reached the big leagues with the White Sox in September 2013, then established himself as an everyday player after they traded him to the Athletics before the 2015 season. Now in his fourth year with the Rangers after six seasons in Oakland and one in Toronto, the Bay Area native has three All-Star selections, two Silver Sluggers, and a Gold Glove on his résumé. Scuffling in the current campaign — Semien has a 47 wRC+ over 176 plate appearances — he nonetheless has 1,533 hits, including 241 home runs, to go with a 108 wRC+ and 36.1 WAR over his major league career.
What did Semien’s Baseball America scouting report look like in the spring of 2013? Moreover, what does he think about it all these years later? Wanting to find out, I shared some of what then-BA contributing writer Phil Rogers wrote, and asked Semien to respond to it.
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“The son of former California wide receiver [Damien] Semien, Marcus was a three-sport standout in high school who followed his father’s footsteps to Berkeley, where he focused on baseball.”
“I actually just played basketball and baseball in high school,” Semien replied. “I was part of a state championship runner-up in my senior year, so I missed probably the first three weeks of my [baseball] season. Once I graduated high school, I knew that baseball was all that I was going to play in college.” Read the rest of this entry »
Mike Bacsik is best known for having surrendered Barry Bonds’s 756th home run. The August 7, 2007 bomb at San Francisco’s AT&T Park gave Bonds the most in MLB history, one more than Henry Aaron. Unlike the legendary bashers, Bacsik is but a mere mortal. A left-handed pitcher for four teams over parts of five seasons, the now-Texas Rangers broadcast analyst appeared in 51 big-league games and logged a record of 10-13 with a 5.46 ERA in 216 innings.
Despite his relative anonymity, the gopher wasn’t the only noteworthy happening in Bacsik’s career. Moreover, those didn’t all take place with him on the mound.
“In my first 14 at-bats, I didn’t get a hit, didn’t strike out, and didn’t walk,” explained Bacsik, who finished 5-for-50 at the dish. “Apparently that’s a record for not having one of those outcomes to begin a career. I didn’t know this until last year when we were in Detroit and they brought it up on the broadcast.”
In Bacsik’s next three plate appearances, he doubled, singled, and struck out — all in the same game. Two years later, in his 44th time standing in a batter’s box, he drew his only career walk.
The first home run that Bacsik allowed — there were 41 in all — was to Kevin Millar. It isn’t his most-memorable outside of the Bonds blast. Read the rest of this entry »
In the introduction to their 2023 Saberseminar presentation, Scott Powers and Vicente Iglesias hit on a fundamental truth about pitching: The variable that bests predicts the outcome of a pitch is the location where it crosses the plate. For a case study, look no further than this tweet from MLB.com’s David Adler about Yoshinobu Yamamoto’s splitters.
Hitters have swung 74 times at Yoshinobu Yamamoto's splitter this season …
If Yamamoto buries his splitter arm side, he’s probably getting a whiff. If it’s on the edge of the zone, it’s likely a foul ball. If it catches plate, it’s getting put in play. The location dictates the outcome.
Given this truth, pitchers who command the ball best ought to dominate. But there’s a catch. As Powers and Iglesias noted, the location is also the variable with the least predictive reliability. If you see a pitcher throw a fastball 98 mph, you can be pretty sure he is going to do it again. A dotted backdoor slider, on the other hand, does not guarantee an entire game of dotted backdoor sliders. Command is both the most important and the least reliable quality for a pitcher.
Scott Powers and Vicente Iglesias, 2023 Saberseminar
Nobody can nail the corners with every pitch. But pitchers can at least minimize the variance of their locations, finding relative reliability within the chaos of command. And in 2025, there is perhaps nobody more reliable than Jacob deGrom.
deGrom’s flat attack angle fastball and firm slider have (justifiably) built his reputation as a stuff monster. Even after easing up on the gas pedal this season, deGrom is still a darling in the eyes of the models. His overall Stuff+ is in the 80th percentile for starters with at least 30 innings pitched, fueled by his depth-y 89-mph slider. PitchingBot likes deGrom even more, ranking him in the top 10 among those pitchers. Over at Baseball Prospectus, the StuffPro model believes deGrom wields four pitches — his curveball and changeup, in addition to the heater and slider — that all grade out as plus.
deGrom’s unbelievable precision came to my attention while writing about Hunter Gaddis for a piece that was published on Monday. As part of my effort to discern whether Gaddis owed his early-season success to slider command (the verdict: inconclusive), I created a version of the Kirby Index for sliders to see where he landed. That metric measured the variance in release angles and release points and distilled those figures into a single score that captured command ability. Originally, it was designed for fastballs, which tend to be thrown to all parts of the strike zone. It perhaps works even better for sliders, which generally are thrown to fewer targets. Gaddis’ rank among his fellow pitchers was nothing remarkable, but deGrom’s name sitting at the very top caught my attention.
Minimum 50 sliders thrown to right-handed hitters.
As I wrote earlier this year, a more straightforward implementation of the Kirby Index would be to just measure the variance of the actual pitch locations. For this story, I calculated the standard deviation of the vertical and horizontal locations of a given pitcher’s sliders; once again, deGrom found himself at the top of the pack. Look at how much distance there is between him and the next closest pitcher:
Minimum 50 sliders thrown to right-handed hitters.
Random tangent here, but you have to admire Luarbert Arias for refusing to throw his junky 82-mph slider anywhere but inside the strike zone.
Anyway, measuring location densities, ultimately, could just point at pitchers who fill up the strike zone; the real test of command is a pitcher’s ability to hit his actual target. To that end, Driveline Baseball provided me with a sample of their proprietary miss distance data. Using Inside Edge tracking data, Driveline measures the distance from the intended target to the actual location of the pitch.
No surprise — deGrom’s slider miss distance ranked first among all pitchers. The league-average miss distance for sliders is about 12.5 inches; this year, deGrom is missing his target by under nine inches, nearly three standard deviations below the average. Any way you slice it, deGrom is commanding his slider like no one else in the sport.
The outcomes have been unassailable. So far, deGrom’s slider has returned a run value of -3.2 per 100 pitches thrown, the best mark for any slider thrown by a starting pitcher. Not only is he getting a bunch of swing and miss — a 38.1% whiff rate, as of this writing — it’s also grabbing a ton of called strikes. When batters do manage to put it in play, they can’t do much with it. The average launch angle on the pitch is just 2°; the xwOBA is a meek .227.
The harmless outcomes on balls in play are a function of deGrom’s targets. To right-handed hitters, he targets the classic low-away corner, breaking off the plate. Note the bimodal distribution on the heatmap — there’s a large concentration of sliders he’ll throw in the zone for strikes, and then another cluster right below the zone that generate chase.
These intentions can be seen in the filtered heatmap clusters. When deGrom throws sliders to righties in zero-strike counts, he tends to be in the zone:
In two-strike counts, he chases the swing and miss:
To lefties, deGrom shows a similar bimodal distribution, but the pattern appears reversed. In early counts, he’s aiming just below the zone; in late counts, he’s looking for called strikes. This sequence to Athletics rookie Nick Kurtz, which featured four sliders, gives a sense of the approach. On 1-0 and 2-0, deGrom tries to bait a chase, but the big lefty resists.
Down 3-0, deGrom fires a middle-middle heater in an auto-take scenario, then returns to the slider in a 3-1 count. Here, deGrom dials in his robotic precision, dotting the lower edge of the strike zone to bring the count full.
On 3-2, he goes there again. Kurtz takes it and pays the price. Though the superimposed strike zone on the broadcast says this pitch is just low, my sense is he deserves that call; if he’s consistently landing pitches within inches of his intended target, you sort of just have to hand it to him.
deGrom isn’t just painting with the slider. I calculated the Kirby Index for four-seam fastballs thrown to righties in 2025; incredibly, he also sits in first place on that list.
Minimum 50 fastballs thrown to right-handed hitters.
As nice as it would be to think that deGrom can be just as good even after dropping two ticks off the fastball, it just isn’t true. Absent improvement elsewhere, losing stuff will bring him back to Earth. But deGrom is far from stagnant. In 2019 — his last full big league season, amid the most dominant phase of his career — his fastball command measured as below average by miss distance. Six years later, it’s hard to argue his command is anything but 80-grade. And as long as the elbow cooperates, it will help him defy gravity.
Welcome to another edition of Five Things I Liked (Or Didn’t Like) This Week. For once, I don’t have a fistful of double plays to show you. I don’t even have that many great catches. The baseball I watched this week was disjointed and messy, the regular season at its finest. Making the easy plays tough? We’ve got that. Bringing in your lefty to face their righty slugger? Got that too. Doubles that weren’t? Collisions between out-of-position players? Yes and yes. So thanks Zach Lowe for the wonderful article format, and let’s get started.
1. Tell ‘Em, Wash
I mean, how hard could first base be? Incredibly hard, of course. The Red Sox and Rangers are both on to their respective Plan Bs at first base after Triston Casas ruptured his patellar tendon and Jake Burger got sent down to Triple-A. No big deal defensively, right? Each team plugged in a utility player — Romy Gonzalez for Boston and Josh Smith for Texas — and moved on with life. Look how easy first is:
Welcome to another edition of Five Things I Liked (Or Didn’t Like) This Week. With the first month of major league baseball in the books, I’m settling into the rhythm of the regular season. Baseball writing in the morning, baseball on TV in the afternoon, and usually baseball on TV in the evening. Every so often, I’ll skip two of those and go to the ballpark instead. The actual baseball is falling into a rhythm, too. The Dodgers have the best record in baseball, Aaron Judge is the best hitter, and Paul Skenes is the best pitcher, just like we all expected. But part of the rhythm of baseball is that the unexpected happens multiple times a day, and that’s what Five Things is for. With a nod of recognition and thanks to Zach Lowe of The Ringer for the column format, let’s start the shenanigans.
1. Stopping at Third
The math is pretty easy: A double with runners on second and third scores both runners. Sometimes it even brings home a guy standing on first at the start of the play, too. Last week, though, things got weird. First, Jacob Stallings flat out demolished a ball off the right field wall, but Hunter Goodman didn’t have the read:
Hey, that happens. There are a few plays like this in the majors every year. The batter can tear around the bases as much as he wants, but runners have to stop and make sure it’s a hit first. Goodman couldn’t be sure that the ball would hit the wall, and with no one out, he quite reasonably played it safe. Blake Dunn played the carom perfectly, and again, with nobody out, Goodman didn’t try his luck at home. Read the rest of this entry »
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. Read the rest of this entry »
Perhaps it was the batting order switcheroo, or maybe it was the minor league ballpark. Bumped out of the leadoff spot for the first time since last August 11, and down to fifth in the order for the first time during Bruce Bochy’s run as manager of the Rangers, Marcus Semien recorded his first multi-hit game of the season on Tuesday night in Sacramento. The 34-year-old second baseman went 2-for-3 with a three-run homer, a walk, a sacrifice fly, and four runs batted in against the Athletics — a much-needed positive sign given his season-opening slump.
Semien’s big night took place at Sutter Health Park, where the relocated A’s and their opponents have bashed out 5.4 runs per game while batting .270/.342/.466. Whether or not the venue was a factor, Bochy’s new lineup worked like a charm, as new leadoff hitter Josh Smith, new no. 2 hitter Wyatt Langford, and the slumping Jake Burger all homered for the Rangers as well. All of the shots were served up by 29-year-old righty Osvaldo Bido; Semien, who had already plated the Rangers’ second run with a first-inning sacrifice fly, crushed a middle-middle sinker 417 feet to center field to break open a 4-2 game in the fifth inning:
The homer was just Semien’s second of the season, and just his third extra-base hit. He entered the game batting .141/.209/.192 for a 17 wRC+, with all four of those numbers ranking among the bottom four among the 170 players with enough plate appearances to qualify for the batting title. His new and improved slash line (.160/.231/.247, 39 wRC+) now puts him among the bottom 10 qualifiers in those categories, but he isn’t close to being the worst on the team. Joc Pederson (.052/.141/.069, -37 wRC+) is having even bigger problems, including an 0-for-3 on Tuesday, but the Rangers don’t have nearly as much invested in him as they do in Semien, whom they signed to a seven-year, $175 million deal in December 2021. Read the rest of this entry »
I have a hot baseball take. The most dominant performer I’ve seen in real life isn’t Shohei Ohtani, or Aaron Judge, or Barry Bonds. It’s Jacob deGrom, and specifically the form that deGrom showed starting in 2019. He mostly threw fastballs and sliders. He only attacked one side of the plate. It sounds like a bad approach, one that a thoughtful hitter could easily exploit. Yet it was absolutely, completely unhittable.
Why? First, deGrom’s fastball is a unicorn. His combination of release point, shape, velocity, and command means that batters are trying to hit flat and even seemingly rising pitches on the edges of the plate. By releasing so low and yet generating so much backspin, he’s defying expectations. By throwing it so hard, he’s giving batters less time to react. By spotting it on the edge of the plate, he’s giving them no good options even if they swing; it’s hard to do damage on pitches that avoid the center of the plate.
From 2020 to 2022, the velocity part of this equation kicked into overdrive. In each of those years, deGrom averaged 98.7 mph or faster with his fastball. But it turns out it still looks pretty good at 97:
Daphne Lemke/USA TODAY NETWORK-Wisconsin-USA TODAY NETWORK via Imagn Images
Every year, most teams hold some sort of team bonding, social event during spring training. The specifics of the event vary from team to team, but frequently they include renting out a movie theater and showing some cloying, inspirational movie like The Blind Side, Cool Runnings, Rudy, or better yet, a documentary like Free Solo. Regardless of the team’s outlook on the year, the goal is to get the players amped up for the season and ready to compete on the field, even if the competition in question is for fourth place in the division.
But what if instead of taking the clichéd route, teams actually tried to select a movie that fits their current vibe, one that’s thematically on brand with the current state of their franchise? They won’t do this because spring training is a time for hope merchants to peddle their wares, even if they’re selling snake oil to sub-.500 teams. But spring training is over. It’s time to get real. So here are my movie selections for each American League team, sorted by release date from oldest to newest.
