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 »
On Wednesday, the Rocket City Trash Pandas shut out Pensacola, 9-0, in the Southern League. In the Midwest League, the Quad Cities River Bandits eked out a 7-6 win over the Dayton Dragons. And in the big leagues, television cameras captured an enormous raccoon traipsing through the Citi Field seats during the seventh inning of the Mets-Pirates game. It was a good day for raccoons at the ballpark.
The major league raccoon went down one row of seats in center field, then back across the next row up, looking for all the world like it was just searching for its seat. “I’m scared of raccoons,” said SNY broadcaster Ron Darling, stammering slightly. The brief clip makes it look like the Citi Field raccoon was simply out for a late-night stroll, not bothering anybody. It turns out there’s more to the story. Read the rest of this entry »
Jesús Made Photo Credit: Curt Hogg/USA TODAY NETWORK via Imagn Images
Below is an analysis of the prospects in the farm system of the Milwaukee Brewers. Scouting reports were compiled with information provided by industry sources as well as our own observations. This is the fifth year we’re delineating between two anticipated relief roles, the abbreviations for which you’ll see in the “position” column below: MIRP for multi-inning relief pitchers, and SIRP for single-inning relief pitchers. The ETAs listed generally correspond to the year a player has to be added to the 40-man roster to avoid being made eligible for the Rule 5 draft. Manual adjustments are made where they seem appropriate, but we use that as a rule of thumb.
A quick overview of what FV (Future Value) means can be found here. A much deeper overview can be found here.
All of the ranked prospects below also appear on The Board, a resource the site offers featuring sortable scouting information for every organization. It has more details (and updated TrackMan data from various sources) than this article and integrates every team’s list so readers can compare prospects across farm systems. It can be found here. 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 »
Roll over Pete Rose, and tell Shoeless Joe Jackson the news. In an historic decision that reversed over eight decades of precedent, on Tuesday commissioner Rob Manfred formally reinstated Rose, Jackson, and 15 other deceased individuals who had previously been placed on the permanently ineligible list for violating Rule 21, which bars players, umpires, and club and league officials and employees from gambling on baseball. The move opens the door for Rose (and Jackson) to be considered for election to the National Baseball Hall of Fame, but that opportunity won’t come until December 2027 at the earliest. Neither their placement on the Classic Baseball Era Committee ballot nor their election to the Hall is automatic even if they do become candidates, as the Hall’s heavy hand in committee proceedings — particularly with regards to players linked to performance-enhancing drugs — should remind us.
Given the extent to which Rose spent decades lying about his gambling and showing a lack of contrition even after he was banned — to say nothing of the allegations of statutory rape that surfaced in recent years — Manfred’s decision is a bitter disappointment, perhaps even a shock. While his decade-long tenure as commissioner has produced no shortage of grounds for criticism, he appeared to be hyper-conscious when it came to drawing a distinction between Major League Baseball’s recent embrace of legalized gambling, and the lines crossed by those who flouted Rule 21. Last June, Pirates infielder Tucupita Marcano was placed on the permanently ineligible list for making 387 baseball bets totaling $150,000 through a legal sports book, while in February, an arbiter upheld the firing of umpire Pat Hoberg for sharing legal sports betting accounts with a professional poker player who bet on baseball, and for impeding MLB’s investigation. Rose’s gambling, via bets placed through bookies, was illegal at the time as well as completely out of bounds given his role within baseball.
Manfred’s latest move was driven by the Rose family’s petition to remove Rose — who died last September 30 at the age of 83 — from the permanently ineligible list so that he can be considered for election to the Hall. Rather than just revisit Rose’s eligibility, however, the commissioner chose to issue a broader ruling that erased what had previously been a meaningful distinction between a popularly misunderstood “lifetime ban” (i.e, one ending with the death of the banned individual) and a permanent spot on baseball’s blacklist. Created by commissioner Kenesaw Mountain Landis in 1920, the permanently ineligible list was reserved for those found to have gambled on baseball (plus a few who committed other transgressions Landis viewed as grave) from future participation within the game. Read the rest of this entry »
But for all that hype, a quarter of the way through the season the results have been a bit of a let down. Boston is right where it was last year: around .500. Disappointing as that may be, most of the individual performances by Red Sox players have been within the realm of expectation. Surely it’s a bummer that Jarren Duran and Walker Buehler have only been about average this year, for instance, but I don’t know that it’s a monumental shock in either case.
If you’ve ever struck up a conversation with a stranger at the ballpark, you might have noticed that the FanGraphs readers are easy to spot. Let’s say you find yourself discussing the Yankees. A FanGraphs reader might ponder whether the 30-point gap between Paul Goldschmidt’s wOBA and xwOBA will catch up to him, while a non-reader is more likely to fret over whether Brian Cashman is too reliant on analytics when constructing the team’s roster. But sometimes, the two groups ask the same thing. So today, let’s consider one of those broad questions: Should teams be intentionally walking Aaron Judge more often?
Admit it. You’ve wondered. If you’re a Yankees fan, you’ve wondered just how long Judge is going to be allowed to hit in big spots. If you’re a fan of the team the Yankees are playing, you’ve wondered how your team’s manager ought to solve this impossible puzzle. And if you’re a neutral fan, well, Aaron Judge is the biggest story in baseball right now. He’s having one of the best offensive stretches in the history of the game. Don’t you want to know if there’s anything that can be done about it?
Ever since Barry Bonds broke the sport in the early 2000s, every hot streak in baseball comes with questions about the “Bonds treatment.” Now, that doesn’t necessarily mean 120 intentional walks, Bonds’ tally in 2004 and the single-season record. (It’s the single-season record by 52 walks. Second place? Barry Bonds. Third place? Barry Bonds.) The best non-Bonds total was Willie McCovey’s 45 in 1969. The most Judge has ever racked up in a single season is a measly 20. So the question isn’t whether teams should treat him like Bonds, because no, they shouldn’t. But should they treat him like McCovey? And more importantly, how should opposing managers handle Judge in a playoff game, when all the chips are on the table? Let’s do some math. Read the rest of this entry »
A papal conclave is the ultimate news story. It’s an event shrouded in ceremony and secrecy, which takes place incredibly rarely; only three times in the past 40 years, in fact. Even in this era when seeing everything has made the mysterious mundane, the world is left waiting in total ignorance for news of white smoke. Billions of observers, Catholic or not, look on in rapt fascination. And when the conclave produced the first American-born pope, Leo XIV, things only got more fascinating.
I come from a Catholic extended family, but for the most part, I was a devoted low-church protestant in my youth and am largely irreligious now. Nevertheless, I’ve always held the Vatican in a certain esteem. Its grandeur, its rituals, its dense and ancient jargon — all of that looks mystical and romantic from a distance. Is it the sole conduit to Almighty God? Perhaps not, from where I sit. But it’s a fascinating institution nonetheless.
That cloud of fairy tale wonder evaporated in an instant on Thursday, when the cardinal electors chose Cardinal Robert Prevost of Chicago to inherit St. Peter’s throne. 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.
