Not So Quick: Purple Sox Lower Fastballs in New Strategy

It’s been a sizzling begin to the 2024 season for the Boston Purple Sox. They began the season with a 10-game street journey to the West Coast and arrived dwelling Monday at 7-3 after a four-game cut up in Seattle, a three-game sweep in what’s going to seemingly be their closing journey to play the A’s in Oakland, and a 2-1 collection win over the Angels. Whereas Boston hasn’t precisely met the best of competitors but — this week’s home-opening collection with Baltimore ought to be a severe check — the Sox entered Tuesday with the second-best run differential within the majors, at +26. Except for the Trevor Story’s harm, which as Jon Becker defined yesterday goes to check Boston’s uninspiring center infield depth, it’s been an encouraging first two weeks for Alex Cora’s membership.

Considerably unexpectedly, pitching has been the story of Boston’s early success, after the Purple Sox redesigned their pitching infrastructure over the offseason. On this regard, two of crucial additions to the membership usually are not present gamers however former huge league pitchers: Craig Breslow, who changed Chaim Bloom because the workforce’s chief baseball officer, and Andrew Bailey, the brand new pitching coach. After pitching as a reliever for 12 years within the majors, together with elements of 5 seasons with the Purple Sox, Breslow spent 5 years within the Cubs’ entrance workplace working to overtake their pitching program. One among Breslow’s first strikes was to rent Bailey, his former Purple Sox teammate. Bailey, a two-time All-Star and the 2009 American League Rookie of the 12 months, came visiting from the Giants, the place he held the identical position and helped to develop the likes of Logan Webb, Kevin Gausman, and Carlos Rodón into a few of baseball’s high pitchers current years. Boston additionally employed Justin Willard to a job it titled “director of pitching.”

Getting into Tuesday, Purple Sox pitchers lead the majors with a 1.49 ERA, a 2.92 FIP, a 3.08 xFIP, 10.49 strikeouts per 9, and a couple of.4 WAR. Two instances by means of the rotation, Tanner Houck hasn’t allowed a run, and Nick Pivetta, Kutter Crawford, and Garrett Whitlock have allowed one earned run every. The bullpen has supported this rotation capably, too — in 37.1 innings, Boston relievers rank second in baseball with 0.8 WAR, third with a 1.45 ERA and three.40 xFIP, and fourth with a 3.18 FIP. All of this from a workers that options principally the identical members from a gaggle that struggled final season. It’s too early to know for certain if 2024 can be any totally different, however that is an auspicious begin.

With new management in place, the pitching method from the Purple Sox has seemed remarkably totally different to date. Most notably, they’re throwing far fewer fastballs and principally abandoning the four-seamer. After throwing four-seamers 26.1% of the time in 2023, they’re all the way down to a league-low 12.9% in 2024, in comparison with the league common of 31.3%. (San Francisco, Bailey’s former workforce, throws the second-fewest proportion of four-seamers, at 18.8%.) Pivetta, who threw four-seamers round 50% of the time for the primary seven years of his profession, is all the way down to 32.8% and as an alternative is ramping up the utilization of his cutter and sweeper. Brayan Bello, who at 24 is the youngest member of the rotation and who signed a six-year extension in March, has eradicated a four-seamer he used 20.6% of the time final yr. So has Houck, who threw it 9.9% of the time final yr — and 38.6% of the time as just lately as 2021. They’ve each ditched it for sinkers. Key bullpen arm Chris Martin threw precisely the identical variety of cutters and four-seamers final yr (249), for a utilization of 34.5% every; to date this yr, 56.6% of his pitches are cutters, in comparison with simply 13.3% four-seamers.

The message from Bailey and his workers is perhaps that four-seamers aren’t all that. In a nice piece from The Athletic’s Jen McCaffrey final week, Bailey talked about how weak fastballs could be to severe injury, and none extra so than four-seamers. In 2023, the pitch was hit exhausting throughout baseball, with the league posting a .349 wOBA and .352 xwOBA on over 230,000 pitches. Sinkers weren’t significantly better, with opposing hitters recording a .345 wOBA and .353 xwOBA towards them. Cutters outperformed each, yielding a .337 wOBA and .338 xwOBA towards.

The distinction was extra pronounced, although, when taking a look at heaters thrown no more durable than 95 mph. In these instances, four-seamers had been hit to a .371 wOBA and .372 xwOBA, sinkers to a .355 wOBA and .363 xwOBA, and cutters to a .339 wOBA and .341 xwOBA. At these decrease speeds, fastballs with out a lot motion seemingly weren’t exhausting sufficient to overwhelm batters; as Bailey sees it, including some minimize or sink may assist these comparatively slower-throwing pitchers. The info seems to again that up:

It may have been the case for Bello and Houck, specifically, whose four-seamers have graded as beneath common on the Stuff+ scale. Bello threw his at 95.5 mph on common, final yr, but it surely left rather a lot to be desired; hitters posted a .424 wOBA off the pitch, whereas his sinker and changeup far outperformed it. Houck threw his at 93.9 mph and with less-than-average motion in each dimensions, and hitters dealt with that to the tune of a .425 wOBA.

Pivetta is a extra nuanced case. His four-seamer has performed properly, the stuff metrics prefer it, and it’s somewhat extra distinct than his different choices — he throws it at 94 mph, and nothing else over 90. He’s nonetheless utilizing it as his major pitch, however mixing in additional cutters and extra of his three breaking balls, most prominently the sweeper that he launched final yr. As for the opposite Sox starters, Crawford is utilizing his major four-seamer (which is perhaps one of the best within the rotation) only a bit much less, however has additionally cranked up the utilization of his sweeper to almost the identical degree — round a 3rd of his pitches. Whitlock retired a seldom-used four-seamer final yr; he has launched a cutter alongside his go-to sinker, however he’s dialed again fastball utilization altogether in favor of extra changeups, sweepers, and sliders.

Typically, the workforce is working to be much less reliant on all fastballs. A few of that is particular game-planning — the Mariners and Angels, two of Boston’s first opponents, had been within the high third of the league towards fastballs in 2023 (although the Angels’ 2024 lineup is brief one specific elite fastball hitter). However Bailey spoke to the press in regards to the significance of soppy offspeed and breaking pitches on limiting exhausting contact, and the Purple Sox appear dedicated to that plan. Final yr, they ranked second in baseball with a 61.3% total fastball utilization. (Bailey’s Giants had been useless final at 44.4%.) In 2024, Boston is all the way down to 51.7%, which ranks twenty second. All 5 starters are throwing fastballs at decrease charges than they did final yr, with Bello, Whitlock, and Houck falling beneath 50%. The workforce went from twenty fourth in breaking ball utilization (28.4%) final yr to sixth (34.6%) within the early goings this season. In 5 aid outings, newcomer Isaiah Campbell has thrown 40 sliders, 20 sweepers, and simply 5 fastballs.

For Bailey and Boston’s run prevention unit, it appears to be about breaking the behavior of going again to a fastball simply because it looks as if some form of default. Right here’s a have a look at final yr’s pitch breakdown, led by four-seamers, sinkers, sliders, and cutters:

And right here is that this yr’s, with sinkers, sliders, and sweepers all outnumbering four-seamers:

How is utilizing mushy offspeed and breaking pitches to restrict exhausting contact going for the Purple Sox? Nicely, no workforce has a decrease common exit velocity than their 86.7 mph. Opposing hitters have a .199 wOBA towards their breaking pitches — the bottom mark in baseball — and a .228 xwOBA, which is the second lowest; their breaking pitches have been value 1.8 runs per 100 pitches, the best breaking-ball run worth within the majors. Their offspeed stuff hasn’t fared as properly, with a .253 wOBA towards that’s Twelfth-best within the majors and a .310 xwOBA towards (seventeenth), however they’ll reside with that, contemplating the rise in offspeed pitches and breaking balls appears to have made their fastballs simpler, too; they’re permitting a .270 wOBA towards heaters, which ranks second finest within the sport, and a league-low .301 xwOBA.

Bailey and Co. aren’t alone of their skepticism of fastballs, and notably four-seamers. Leaguewide four-seamer utilization has been trending downward since 2021, falling from 35.4% that yr to 32.2% in 2023 and 31.3% to date this yr. However the Purple Sox appear to be asking: Why even throw that many? If we’re beginning to lose religion in four-seamers — notably the unspectacular ones — why use a 3rd of our pitches on them? Why not get forward of the curve — or, extra exactly, forward of the fastball — when it comes to slicing out the warmth?

The caveats of April are severe — the Purple Sox haven’t even thrown a pitch at Fenway Park but. However what is perhaps most enjoyable for Boston followers is the institution of a pitching infrastructure that appears to have some conviction within the route it’s headed, with buy-in from the gamers to the entrance workplace. For a franchise that has struggled mightily to develop younger pitching expertise for some time now, that’s a giant step in the precise route.