In late June and in just his fourth major league start, Marlins right-hander Zach Thompson accomplished something that has only been done nine times in the last decade. Facing the Nationals, he went six innings, allowed just two runs (one earned), and struck out 11. In the process, he became the 10th pitcher in the last 10 seasons to strike out 11 or more batters in his first four career appearances — certainly a qualifier-heavy fact, but it still yields quite an impressive list of names:

As the table shows, it’s rare to break into the major leagues with the level of dominance that Thompson displayed, but his path here has been even more fascinating.

In perhaps the most innocuous of moves, the Marlins signed Thompson last November as a minor league free agent to serve as additional bullpen depth. Even still, he was one of the team’s top targets on the minor league free-agent market, Marlins director of pro scouting Hadi Raad told Christina De Nicola of MLB.com, in what he said was based on a blend of scouting and analytics. As Marlins manager Don Mattingly told De Nicola after Thompson’s start against the Nationals, “It’s like, ‘How does this guy get away from teams?’ I liked his stuff, but you never know where that goes, too, after spring training. Sometimes those guys go to Triple-A and you never see them again. Zach, I think, started a little slow, and then kind of got it going. He’s been impressive, so hopefully this just keeps going.” Read the rest of this entry »

It’s pretty evident that Major League Baseball’s crackdown on foreign substances will have wide-ranging effects on the sport. Offense is almost certainly due to increase; that that has yet to happen (at least beyond normal temperature-related effects) may only be a question of time. But with spin rates plummeting and pitchers telling the media that they are “trying to figure out how to pitch again” as a result of the new policies, it seems that we’re bound to see broad changes sooner rather than later.

The hurler who supplied the quote above is none other than right-hander Garrett Richards, an 11-year major league veteran currently pitching for the Red Sox. Boston signed Richards this past February to a one-year, $10 million contract that included a club option for 2022, a deal meant to shore up depth for a rotation that was a weak spot for the team as it entered the 2021 season. And though he has dealt with a collection of arm injuries throughout his career — including a 2018 Tommy John surgery that forced him to miss almost all of 2019 — Richards posted solid peripherals with the Padres last season and was heralded for his league-leading spin rates.

Through Richards’ first 11 starts this season, it seemed like Boston’s gamble had paid off. He wasn’t putting up elite numbers, but a 3.75 ERA, 20.2 K%, 11.6 BB%, and a 4.06 FIP is certainly serviceable. Through his start on June 1, Richards was worth 0.9 WAR, putting him in a virtual tie with Martín Pérez and Eduardo Rodriguez in terms of value. As for Boston’s starting staff as a whole, their combined 6.4 WAR through June 1 ranked fifth in the majors, which represented quite the pleasant surprise given that their rotation ranked 16th in our preseason power rankings. Read the rest of this entry »

After hitting 62 home runs over his first two seasons in the big leagues — his age-21 and age-22 seasons, no less — Gleyber Torres was hailed as baseball’s next superstar. Even in lineups featuring Aaron Judge, Giancarlo Stanton, and Gary Sánchez, no Yankees player hit more homers over the 2018 and ’19 seasons than Torres. And while subpar defense limited his overall ceiling, his 5.6 WAR over that stretch still represented an impressive output for a player that young.

In 2020, however, the power that defined Torres’ offensive production all but disappeared. Torres, who posted a .235 ISO in 1,088 plate appearances over his first two seasons, slashed just .243/.356/.368 last season, good for a .125 ISO. He homered just three times in 160 plate appearances, but improved plate discipline — his walk rate jumped 5.5 points compared to his career averages, while his strikeout rate fell 5.6 — drove what remained above-average offensive output. Torres still posted a 106 wRC+, but he couldn’t outhit his defense like he had the two years prior and posted just 0.2 WAR.

Read the rest of this entry »

What if I told you that there is a pitcher who throws 92 mph but is actually throwing 95? That’s just Bailey Falter’s niche. Despite only throwing nine major league innings in his career to date, Falter has already shot to the top of some important leaderboards: release extension and average velocity added.

Here are the top-10 fastballs in June, sorted not by average velocity, but instead by average added velocity, which is the result of simple subtraction: effective velocity minus release speed. Effective velocity estimates the “actual” pitch speed the hitter faces based on where the pitcher releases the baseball and how much time the hitter has to react. If a pitcher releases the ball closer to home plate, the batter has less time to react, effectively (there’s that word again) making the pitch come in faster. This is music to Falter’s ears:

Read the rest of this entry »

In no world is Juan Soto is having a bad year. Through games played on Saturday, he has more walks than strikeouts, a 128 wRC+, and a .272/.404/.426 triple slash in 240 plate appearances. He’s been worth 1.6 WAR in 58 games, thanks at least in part due to improved defense; ZiPS projects him to add another 3.5 wins the rest of the way, which would result in a career-high 5.1 WAR. Even at his current pace of 4.5 WAR, Soto would end the season as one of the more valuable players in baseball.

By his standards, however, Soto is actually having a bit of a down year. That 128 wRC+ I mentioned? That is just above his worst mark in any 58-game stretch (127) of his entire career. It still represents great production in a vacuum, and the fact that his worst wRC+ still is 127 is just another way to underscore his greatness. But at the same time, it still leaves us with a lot of questions, none more important than this: Why has Soto seen such a notable decrease in performance?

The answer might seem somewhat simple: He’s hitting far too many groundballs. Soto currently has a 55.3% groundball rate, seventh-highest in the majors. The fact that he’s still posting a 128 wRC+ in spite of that is borderline absurd; of the 30 qualified hitters with at least a 48% groundball rate, he has the highest wRC+, a testament to his phenomenal plate discipline and frequency of hard contact.

As a result of all of these grounders, Soto is embarking on Vladimir Guerrero Jr.’s 2020 journey. But while Vlad Jr. is currently elevating and celebrating this year, Soto is grounding and outing. Bad attempt at a rhyme aside, his groundballs mostly turn into outs. The ones that aren’t outs? They are singles, and they the reason why he has experienced a personal power outage. In his last 50 games, he has a .137 ISO, another career low for a sample that large.

Read the rest of this entry »

Jacob deGrom is on another planet right now. You don’t need me to tell you this, but it’s fun to just marvel at his stats. Through 10 starts, deGrom has a 0.56 ERA, a 46% strikeout rate, and a 4% walk rate. He’s produced 3.7 WAR, which is nearly a half-win better than the next-best pitcher, Corbin Burnes, who has “merely” put up 3.3.

deGrom is quite possibly in the midst of one of the best pitching seasons in baseball history, particularly on a per-inning basis. Pedro Martinez’s 1999 campaign currently holds the single-season pitching WAR record at 11.6, and though deGrom almost certainly won’t hit that mark, he’d blow it away if he pitched the same number of innings at his current rate. Give deGrom Martinez’s 213.1 innings, and at this pace, he’d put up 12.3 WAR. Say what you will about injuries and starting pitching workloads in this era, but that’s just a primer on the level of dominance deGrom has reached so far in 2021.

So if you’re a hitter stepping in against deGrom, how in the world do you get a hit off this guy? Batters are slashing just .121/.152/.220 against him, good for a .163 wOBA allowed. That’s the best mark among the 294 pitchers with at least 100 batters faced this season, and deGrom has more than doubled that threshold (223 TBF). If you’re hitting against deGrom, you’re lucky if you just put the ball in play, let alone get on base.

Is there an alternative strategy that works here? deGrom is raking up all of these strikeouts — without allowing virtually any walks — while boasting the seventh-lowest Zone% in baseball. Hitters are flailing against pitches that aren’t even strikes anyway: 60.5% of the time, deGrom is throwing the hitter a ball. If you’re in a two-strike count, he’ll throw you a ball 64.5% of the time, putting him in the 91st percentile in O-Zone%. Read the rest of this entry »

In our preseason positional power rankings of the league’s third basemen, the Braves came in at No. 25, projecting for just 1.4 WAR at the position, with Jason Martinez writing not only about Austin Riley’s potential contributions, but also possible production from Jake Lamb. Roughly two-and-a-half months later, the picture looks entirely different: Lamb never took an at-bat in Atlanta (though he’s playing well for the White Sox), while Riley has put together a very solid offensive season. In 59 games and 231 plate appearances through June 9, he’s slashing .300/.381/.515 with 11 home runs and a 142 wRC+ and has accumulated nearly as much WAR by himself (1.3) as the team’s total positional projection. As a result, the Braves have gotten some of the best value in the majors at third base relative to those projections. (The Rangers mess with the table a touch, since they were projected for and have achieved negative value so far, but I digress.)

Read the rest of this entry »

Major League Baseball is preparing to crack down on pitchers’ use of foreign substances, which could have important ramifications for how the game is played not just the rest of this season, but for a long time to come. Such a remarkable midseason change in enforcement — one report from ESPN’s Buster Olney suggested that umpires might randomly check baseballs 8–10 times per game — could alter league-wide offense, perhaps to a rather large degree depending on the number of pitchers who doctor the baseball.

Two things seems fairly certain, though. First, foreign substances increase spin rates; second, spin rates significantly impact pitcher performance. An experiment run by Travis Sawchik at theScore demonstrated that certain substances, like Spider Tack, could add as much as 500 rpms to a fastball. One college pitcher, Spencer Curran from Seton Hall University, saw the baseline rpm on his fastball go from 2,096 without any substances to 2,516 with Spider Tack and without any velocity increase — a jump that likely cannot happen naturally.

“It’s probably pretty hard to change that [fastball spin] ratio for an individual,” University of Illinois physics professor Alan Nathan told Sawchik at FiveThirtyEight. “I can see that you could do it for a curveball because a curveball involves some technique, whereas a fastball is pure power. There is no finesse.”

In a comprehensive story published by Stephanie Apstein and Alex Prewitt at Sports Illustrated, one recently retired pitcher estimated that 80% to 90% of pitchers currently use some form of foreign substances. But even with pervasive use, not all sticky stuff has the same impact. As Sawchik showed in his experiment, some substances — like a sunscreen mix he used — may actually decrease spin rates. Some of it may depend on how much time each pitcher has had to experiment in front of a Rapsodo, trying different concoctions until something works to their liking.

In both articles, the authors highlighted some basic stats to show how spin rate impacts batter performance. Sawchik noted that batters are hitting .264 on four-seam fastballs that range from 2,250–2,350 rpms, but just .217 on those above 2,500. That’s a sizable gap, and numbers like that have definitely caught MLB’s attention. As one executive told SI, though MLB is considering many changes to increase offense, he believes that better enforcement of the foreign substances rule already on the books — Rule 6.02(c) — would go a long way.

“I think people would be absolutely shocked if they actually enforced this, how much you’ll start to normalize things without rule changes,” the executive said.

Read the rest of this entry »

At the beginning of May, I wrote two articles about the slightly-deadened baseball’s effect on league-wide home run rates. The conclusion was pretty much exactly what you’d expect: A bouncier ball with more drag did reduce home runs, particularly among softer-hit balls at lower launch angles. In 2019, these events were the wall scrapers that barely went out of the yard. In 2021, these events are now doubles and outs, with the increase in fly outs likely contributing (at least somewhat) to baseball’s diminished run environment overall.

There were a handful of outstanding questions that I still had, one of which was the impact of the new baseball on a ballpark-by-ballpark basis. Though league-wide trends are certainly an interesting and informative way to see the effects of a new baseball on run scoring, it is also important to examine in which parks hitters are having a more difficult time getting the ball into the seats. That allows us to understand better how park effects may have been altered to different degrees as a result of MLB’s switch to the new baseball.

But it’s not just the baseball that is contributing here. MLB reportedly added humidors to five stadiums for the 2021 season, bringing the total league-wide to 10. The Rockies, Diamondbacks, Mariners, Mets, and Red Sox already had humidors in their stadiums pre-2021, but which five teams are new to that list has yet to be disclosed. We can only guess which parks now have them, but it is important to keep in mind that the ball is not the only difference.

Also important to remember when looking at ballpark-level data: The players on the home team make a huge difference in determining home run rates. It’s entirely possible that, between 2019 and ’21, a team added home run hitters to its lineup or acquired home run-adverse pitchers for its staff, or the opposite could also be true. To mitigate these effects, I only analyzed a specific slice of fly balls: those hit at an exit velocity at or above 95.0 mph, at an exit velocity below 110.0 mph, and at a launch angle below 30 degrees — the very fly balls most impacted by the new baseball in my prior analysis. I also only included fly balls hit in games on or before May 31 to control for weather effects. (That is why I am comparing 2019 to ’21.)

Read the rest of this entry »

On Tuesday, the Phillies placed Bryce Harper on the 10-day injured list with a bruised left wrist after insisting for days that their star rightfielder was healthy. Last Sunday, when asked if Harper was out of the lineup due to any medical issues, manager Joe Girardi flatly told reporters, including Matt Gelb of The Athletic, “No. [It’s] just a day off. Just a day off.” When Harper missed a second consecutive game, Girardi again denied that anything was wrong, saying, “I went to bed last night, woke up this morning and said, ‘You know what? I’m going to give him another day.’ And that’s the reason.”

But once Harper was officially on the IL, Girardi finally admitted that he had been dishonest with the media, citing that he’d face a competitive disadvantage if he noted publicly that Harper’s wrist was causing him discomfort. “There is a distinct advantage to the other manager if I tell you a guy’s wrist is hurt,” he said. “And the idea here is to win games…. I understand you want to know. But there are distinct advantages that I can give another club if they know everything that’s going on over here. So I’m sorry that I had to do that. But we’re trying to win games, and he’s just not ready to go. I thought he’d be ready on Monday or Tuesday. He’s not.”

Read the rest of this entry »