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.
Things did not go well for the Cubs’ Ryan Pressly on Tuesday night against the Giants at Wrigley Field. Chicago had clawed its way back from a fourth-inning, 5-2 deficit, capped by a two-run, ninth-inning rally that sent the game into extra innings. After an uneventful 10th, all hell broke loose in the 11th, as Pressly failed to retire any of the eight batters he faced. By the time the dust settled, nine runs had scored, and unlike the Cubs’ April 18 game against the Diamondbacks, where they answered 10 eighth-inning runs with six of their own on the bottom of the frame and won 13-11, this time they fell 14-5.
As you might expect, it took a bad break or two to blow the doors open in that 11th inning. Following a double by Heliot Ramos and an RBI single by Patrick Bailey, Brett Wisely laid down a sacrifice bunt toward the first base side of the mound. Pressly fielded the ball and made an awkward, backhanded flip to Carson Kelly, but the ball dribbled under the catcher’s glove. Ramos was safe at home and Wisely reached first, still with nobody out. Mike Yastrzemski walked to load the bases, and then Willy Adames was hit by a pitch to force in Bailey. On the replay, it looked like a wild pitch that had gotten by Kelly, which would have advanced the runners and scored the run nonetheless, but home plate umpire Bill Miller ruled the ball had grazed Adames. The call was upheld after the Cubs challenged it, adding another baserunner to the mix, and consecutive singles by Jung Hoo Lee, Matt Chapman, and Wilmer Flores brought in four more runs (two on Chapman’s hit). With the score already a lopsided 11-5, Cubs manager Craig Counsell mercifully gave Pressly the hook.
The onslaught didn’t stop. Reliever Caleb Thielbar entered and finally recorded the first out by striking out Christian Koss before serving up an RBI double to Ramos. Bailey added a sacrifice fly before David Villar, pinch-hitting for Wisely, struck out. The Cubs went down in order against Kyle Harrison in the bottom of the 11th, and that was that. Read the rest of this entry »
I didn’t expect this from Wilyer Abreu. Don’t get me wrong. I love Abreu and I spent much of the offseason writing about him. I even developed a (literal) sliding scale to tabulate just how often and how intensely he dirtied his uniform. Abreu is a high-effort player who absolutely deserved the Rookie of the Year votes and Gold Glove he got last season. But I worried about him too. Abreu has done nothing but hit and play great defense since his 2023 debut, but he’s a lefty who’s been strictly platooned, and he only recently reached a full season’s worth of big league plate appearances. He seemed like a regression candidate, and that was before a gastrointestinal illness cost him a chunk of spring training and several pounds. The Red Sox weren’t even sure he’d be ready to start the season, but he was and he’s raked from day one. After this hot start, should we be all-in on Abreu?
First, I was worried a bit about Abreu’s defense. I didn’t expect him to turn into a pumpkin. He really was the best right fielder in baseball last season by pretty much any measure you can think of, and I expected him to remain great. Although he’s not a speedster, his instincts and effort have allowed him to make three three-star catches, two four-star catches, and one five-star catch this season. However, a ton of his value last year came from nine assists, and as I wrote in the Positional Power Rankings, that’s a volatile stat. You can’t just expect someone to rack up assists year after year, if for no other reason than the fact that word gets out about a rocket arm like Abreu’s. Those gaudy out totals would turn into smaller credits for keeping runners from taking extra bases. Or so I thought. Read the rest of this entry »
Lucas Giolito is looking to return to form following elbow surgery that cost him all of last year. Now 30 years old and in his first season on mound with the Boston Red Sox, Giolito has made a pair of starts — one solid, another squalid — in which he has surrendered 15 hits and nine runs over 9 2/3 innings. At his best, he’s been a top-of-the-rotation pitcher. From 2019-2021, the 6-foot-6 right-hander fashioned a 3.47 ERA and a 3.54 FIP while making a team-high 72 starts for the Chicago White Sox.
Turn the clock back 10 years, and Giolito sat atop our 2015 Washington Nationals Top Prospects list. Our then-lead prospect analyst Kiley McDaniel was understandably bullish about Giolito, writing that the 2012 first-round draft pick had true no. 1 upside.
What did Giolito’s FanGraphs scouting report look like at the time? Moreover, what does he think about it all these years later? Wanting to find out, I shared some of what McDaniel wrote and asked Giolito to respond to it.
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“Giolito was nationally known by scouts all the way back to when he hit 95 mph at age 15.”
“I always threw hard,” Giolito said. “I was one of the hardest throwers in Little League and everything like that. I started long tossing a lot around the time I got to high school, and just kept building and building. I think I hit 90 when I was 14, and then 95 maybe closer to my 16th birthday. So yeah, it kept going up until I blew my elbow out.
“Probably,” Giolito responded when asked if the velocity was too much, too early. “There wasn’t too much understanding on the medical side, like strengthening, stability — all the stuff that we’re doing now to maintain the little muscles, the big muscles, to support your body when it’s outputting that much force. I was also very skinny. My shoulder blades winged out. I didn’t have much muscular development at that age, but I was moving very fast. It eventually caught up to me.”
“[He] was in the running to go 1-1 as one of the top prep pitchers of all time, until he was shut down with a sprained UCL in his elbow. This led to an expected Tommy John surgery one outing after he signed for an $800,000 overslot bonus as the 16th overall pick.”
“I remember having an outing where I think the Astros’ GM came to see me pitch in person,” Giolito said. “I pitched really well that day. I was on top of the world. It was like, ‘Oh my God, I might be the first-overall pick if I just continue what I’m doing for the rest of the season.’ It was the next outing, or maybe two outings later, where I hurt my elbow. I had to shut down. We didn’t want to do the full TJ yet, because we thought that would hurt me in the draft. Plus, if I was going to get TJ, I wanted to be in a professional organization where you get access to the best care. I tried to rehab it.
“Going into the draft, I had no idea,” added Giolito, a product of Harvard-Westlake High School. “I thought I’d be picked somewhere in the first three rounds, that a team would take a flier on me. I didn’t know I’d be in the first round. That was kind of the beginning of the pre-draft-deal era, but I literally was watching the draft on the TV when they said my name. That was when I found out I was drafted in the first round.
“The Nationals picked me. I was a prep arm with a blown-out elbow, which is a big, big risk. I have Stephen Strasburg to thank, because he was a big prospect who came up, blew his elbow out, got Tommy John, and had a relatively successful recovery from that. The Nationals kind of saw me in that same vein. It was, ‘OK, we’ll get this guy. He’ll have TJ, but we feel confident with this.’”
“The stuff was all the way back this year as he dominated Low-A at age 19/20 in his first full year coming off of surgery. The Nationals were understandably conservative with pitch and innings counts.”
“My first full season back they had my innings count at 100,” Giolito recalled. “I got to 100 innings and they shut me down, and that sucked, because our team was so good. Our starting rotation consisted of me, Reynaldo López, Nick Pivetta. Austin Voth was in the rotation, but he got sent up to High-A at some point that year. We had a really nasty one-two-three with me, Reynaldo, and Nick, but then I got shut down with a few weeks left in the season and had to be a cheerleader. We ended up losing in the playoffs.”
“His knockout curveball, which gets 65 or 70 grades from scouts, is his signature offspeed pitch.”
“Not any more,” replied the righty. “I still have it, but I don’t throw it as often. I always say that Tommy John gave me my changeup. When I was recovering I messed around with changeup grips a lot and found one that was comfortable. I threw it a lot in that same season you mentioned, that Low-A season. I threw a ton of changeups, because the curveball made my elbow hurt that first season back.
“My curveball was good in the minor leagues — I still used it — but we mixed that changeup in a lot. Over time, especially when I developed the slider, the changeup really became the big pitch for me.”
“He has true no. 1 starter upside.”
“Yeah, I mean, I had that with the White Sox for a couple of years,” Giolito said. “I still have confidence that I have true no. 1 starter upside. I just have to come back from this thing and develop some good consistency.”
Charlie Morton has been about to retire for a while now. The lanky curveball specialist first made headlines in the early 2010s; he’d been struggling over his first three major league seasons, so he came up with a novel, but hilariously simple, solution: Copy what Roy Halladay was doing. It worked for a while, but injuries piled up, and it wasn’t until Morton landed with the Astros in 2017 that he really, truly put it together.
In the first season of a two-year deal with the Astros, Morton set new career highs in wins, WAR, and strikeouts. He not only won a championship for the first time in his career, he was the winning pitcher in Game 7 of both the ALCS and the World Series, and got the last out of the season in the latter case. He turned 34 five days after the Astros’ championship parade, and by the following spring he was already musing publicly about hanging up his spikes. Read the rest of this entry »
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:
It’s rough being a reliever. Your whole career is a small sample. Emmanuel Clase has been one of the best pitchers in baseball since pretty much the moment he set foot on a major league mound in 2019, but over his entire career, he’s thrown just 338 innings. Our leaderboard says that total has been bested in 534 different player-seasons. That’s 534 times that one single player in one single season threw more innings than Clase has over his whole career. Clase set a personal best by throwing 74 1/3 innings last season, and on the individual season leaderboard, that total put him in a 79-way tie for 20,484th place. A small sample size means high variance. Over his entire career, Clase has never finished a season with an xFIP below 2.18 or above 3.42, which is pretty stable for a reliever. But after running a microscopic 0.61 ERA last season, his ERA is currently a so-big-you-can-see-it-from-space 5.51. Five-run swings are decidedly less stable.
When things go wrong to this degree, it’s usually because a combination of factors have conspired to make it happen. When you’re as good a pitcher as Clase, it takes both luck and skill to get results this bad. Our focus today will be on the extraneous factors. You know what else is subject to wild variations in short samples? Defense. And defense is letting Clase down in a big way. We’re here today because Mike Petriello asked me to look into something. Petriello is Major League Baseball’s Director of Stats and Research, and it’s my understanding that as such, I am legally required to investigate any statistical anomalies he assigns me. Here’s what he sent my way:
When Clase was on the mound in 2024, the Guardians racked up 5 Outs Above Average. They were great defensively. This season, even though he’s only pitched roughly one-fifth of the innings he did last year, Guardians fielders are already all the way down at -4. That’s an absurdly big swing. How is that even possible? Is it just luck? Read the rest of this entry »
Jackson Chourio is a star. You can see it the second he steps to the plate. He looks like he’s always been in a batter’s box, like hitting comes as easily as breathing. He has easy power and shockingly good contact skills for someone who swings so hard. So, uh, why can’t he take a walk?
Fine, that’s hyperbole. It’s May 8, 38 games into the season, and he’s walked three times in 165 plate appearances. That works out to a 1.8% walk rate, the third lowest among qualified hitters. Jacob Wilson? He’s walked six times already. Michael Harris II? Four walks in fewer games. Name a guy you think can’t walk, with the exception of platoon players Kerry Carpenter and Michael Massey, and you can be sure that Chourio is walking meaningfully less than they are. Chourio didn’t walk a ton in 2024 – his 6.8% walk rate was in the 31st percentile – but this is something different entirely.
Naturally, when I started writing this piece before Tuesday’s game, Chourio had two walks in 161 plate appearances for the lowest walk rate in baseball, but then he walked his second time up in the Brewers’ 9-1 loss to the Astros. (For the rest of this article, I’ll be using stats as of the start of play on Tuesday.) Anyway, the point still stands: Chourio isn’t walking. What’s going on here? Read the rest of this entry »
Matt Seelinger has taken an atypical path to the doorstep of the big leagues. Drafted in the 28th round by the Pittsburgh Pirates out of Division-III Farmingdale State College in 2017, the 30-year-old right-hander subsequently played in the Tampa Bay Rays, San Francisco Giants, and Philadelphia Phillies organizations before getting released and hooking on with the Atlantic League’s Long Island Ducks before the 2024 season. His fortunes turned last summer. The Detroit Tigers signed Seelinger in late June, and since returning to affiliated ball he has logged a 1.26 ERA and a 38.4% strikeout rate over 29 relief appearances between Double-A Erie and Triple-A Toledo. So far this season, the Westbury, New York native has a 4-0 record to go with a 0.57 ERA and a 30.9% strikeout rate over nine appearances, the last five of them with the Mud Hens.
His signature pitch is every bit as notable as his late-bloomer success. Seelinger’s repertoire includes a four-seam fastball and a cutter/slider, but it is his unique offering with an unorthodox grip that most stands out. Seelinger shared the story behind it when Toledo visited Triple-A Worcester last week.
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David Laurila: You throw a unique pitch. What exactly is it?
Matt Seelinger: “So, it was coined on Long Island, where I’m from. It’s called a knuckle drop. Basically, what I do is take a four-seam fastball grip and flip it so that the horseshoe is on the inside. I take my two fingers — my pointer finger and my middle finger — and bend them. I take the top lace, and put them on the bottom of it. I put my ring finger and pinky on the seams. The thumb, I try to get underneath as much as possible, although thumb placement isn’t as big of deal as long as it’s not too high up on the ball. From there, I throw it just like a fastball, only I’m pushing it out.”
