About a quarter of the way through the 2024 season, I took a look at how the most prominent examples of teams’ attempts to turn an established reliever into a starter had progressed. At the time, the majority of these experiments were going well, by and large. At that mid-May juncture, most of the relievers making the switch had yet to reach their innings workloads from the season prior. Now that we’re at the season’s halfway point, that’s no longer the case. Many of the pitchers striving to make this jump are now approaching or have already eclipsed their 2023 innings totals — if not their career-high workloads — so it seems a good time to check back on how they’re faring.
As a reminder, the focus here is pitchers who pitched exclusively or near-exclusively out of the bullpen last season. Someone like the Rays’ Zack Littell or Red Sox’ Kutter Crawford, who moved into the rotation last summer and continued that move this year, isn’t the focus.
Garrett Crochet, LHP, White Sox
Stats at quarter mark: 9 games started, 46 2/3 innings, 4.63 ERA (2.47 SIERA), 34.2 K%, 4.8 BB%, 43.8 GB%
Stats since: 9 GS, 54 2/3 innings, 1.65 ERA (2.27 SIERA), 36.3 K%, 5.2 BB%, 45.5 GB%
At the 25% mark of the season, Crochet sat on a pedestrian ERA but elite K-BB profile. His production had been skewed by a series of three straight rough outings: five runs versus the Reds, seven in Philadelphia and another five in Minnesota.
Those three starts still stand as the worst three of his season. Crochet hasn’t yielded more than three runs in a single outing since that time. He’s not only maintained his elite K-BB profile but improved upon it, slightly upping his strikeout rate while sustaining his exceptional command. No starter in baseball is striking out hitters at a higher rate than Crochet, and only 12 are limiting their walks more effectively.
At last check, Crochet had ace-like rate stats but pedestrian run-prevention numbers overall. That’s no longer the case. The only question as to whether Crochet is a bona fide No. 1 starter is one of durability. All of the pieces are there, but Crochet has never pitched a full season in the rotation. In fact, this year’s combined 101 1/3 innings not only stand as a career-high, they eclipse his combined total of professional innings pitched — majors and minors combined — since being selected in the first round of the 2020 draft.
With two and a half years of team control left, a bottom-of-the-barrel $800K salary and the worst team in baseball behind him, Crochet stands as a clear-cut trade candidate. The Sox reportedly broached the possibility of an extension with him but are now expecting to trade him after contract talks failed to progress. A new team will have to worry about how Crochet will hold up down the stretch, but there’s little doubting that he’s a front-of-the-rotation talent.
Jordan Hicks, RHP, Giants
Stats at quarter mark: 9 GS, 48 innings, 2.44 ERA (3.99 SIERA), 19.9 K%, 8.2 BB%, 56.2 GB%
Stats since: 8 GS, 37 2/3 innings, 4.54 ERA (4.29 SIERA), 22.2 K%, 10.2 BB%, 45.8 GB%
Early on, Hicks was thriving in terms of run-prevention in spite of a pedestrian strikeout rate. He’s picked up the strikeout rate a bit since that time but has seen his command, ground-ball rate and velocity all drop. After averaging 5 1/3 innings through his first nine starts, Hicks is averaging about 4 2/3 innings per outing and has seen his average sinker velocity drop by nearly two miles per hour. Since mid-May, his sinker is averaging 93.5 mph — down from the 95.5 mph at last check and even further from the 100.2 mph Hicks averaged in his time as a reliever.
Hicks has struggled to turn the lineup over multiple times. Opponents own an awful .196/.268/.348 slash when facing him the first time in a game. Unlike many pitchers, who experience a stark drop when facing opponents a third time, Hicks’ troubles begin the second trip through the order. Opponents in those settings carry a .267/.373/.382 slash. He’s only faced a hitter for the third time on a given day 57 times this season, but opponents have batted .283/.333/.434 in that small sample.
Back in May, I noted that opponents had posted an embarrassing .079/.167/.105 slash in the 42 plate appearances Hicks had finished off with a splitter. They’ve fared better against the pitch since that time, though it’d be hard to have performed much worse. And, with opponents still slashing only .160/.244/.272 against the pitch (which Statcast credits with a .270 expected wOBA), that newly implemented offering still has the look of a plus pitch.
Hicks has remained reasonably effective but hasn’t been the roaring success he was through the first quarter of the season. San Francisco signed the 27-year-old flamethrower to a four-year, $44MM deal and did so with an eye toward Hicks starting, so it’s clear this is a multi-year undertaking. Nothing Hicks has done to date suggests he decidedly can’t handle being a starter, but he’s faded from his early-season production, which is perhaps to be expected for a pitcher whose 85 2/3 innings are already a career-high mark.
The manner in which Hicks has begun to fade only further underscores the remarkable nature of Crochet’s performance to date as he navigates uncharted workload territory. That said, Hicks has an overall 3.36 ERA with a nearly average strikeout rate, a manageable walk rate and a plus ground-ball rate. There have been some roadblocks of late, but this year could serve as a launching pad to a better performance in 2025-27, when he’s more accustomed to his current workload.
Reynaldo Lopez, RHP, Braves
Stats at quarter mark: 7 GS, 40 1/3 innings, 1.34 ERA (4.00 SIERA), 25.2 K%, 10.1 BB%, 40.2 GB%
Stats since: 7 GS, 39 innings, 2.08 ERA (3.58 SIERA), 26.1 K%, 7.0 BB%, 32.7 GB%
The Braves have been judicious with Lopez’s start-by-start workload thus far. He hasn’t topped 94 pitches in a single appearance and has only recorded four outs after the sixth inning all season. So far, that level of caution has paid off. Since last check, Lopez hasn’t lost any life of his heater and has actually tacked on 0.4 mph on average, per Statcast.
Atlanta doesn’t often give Lopez the opportunity to turn the lineup over a third time, and the opportunities he’s had haven’t gone well. Lopez has yielded a mid-.500s OPS to opponents the first or second time through the order but has been tagged for a .245/.359/.396 batting line the third time through. It’s not egregious, but it’s far less dominant than his first couple trips through a lineup.
Lopez is still running a plus strikeout rate, and he’s improved his command and his velocity as the season has worn on. As the only member of this list who’s previously worked multiple full seasons as a starter, he might have been the best-equipped to handle this transition, and so far it doesn’t appear he’s slowing down much at all.
Lopez entered the season with a career 71.1% strand rate, and he’s currently stranding 86.3% of his baserunners. His .279 average on balls in play is lower than league average but right in line with his career .281 mark. He’s allowed only 0.45 homers per nine frames, thanks in large part to a paltry 4.7% homer-to-flyball ratio that sits well shy of his career 11.3% mark. There’s some correlation there; it’s easier to strand runners if you’re almost never allowing a ball to clear the outfield fence, after all. In all likelihood, both that HR/FB and strand rate will trend toward his career marks as the season (and, more broadly, his three-year contract) wears on, but the outside-the-box bet on Lopez as a starter looks like one that will pay off for Atlanta.
Jose Soriano, RHP, Angels
Stats at quarter mark: 7 GS, 38 2/3 innings, 3.72 ERA (4.03 SIERA), 20.3 K%, 9.5 BB%, 61.5 GB%
Stats since: 5 GS, 33 2/3 innings, 3.21 ERA (3.97 SIERA), 16.9 K%, 6.2 BB%, 58.6 GB%
Soriano was continuing his sharp start to the season when he was scratched from a mid-June start due to abdominal pain. The Halos discovered an infection in the young righty’s abdomen that required a trip to the injured list and was expected to sideline him a few weeks. That’s thrown a bit of a wrench into his rotation breakout, though there’s no indication it’s a serious issue and the Halos can take solace in the fact that there’s no arm issue at play. And, after pitching just 65 1/3 innings last season, Soriano is already at 72 1/3 frames this year, so perhaps it can serve as a well-timed breather for his right arm.
The 25-year-old Soriano’s first run as a starter in the big leagues this season looked promising through mid-May and continues to do so. Impressively, he hasn’t lost any life on his four-seamer or sinker despite the shift from short relief to starting work. Statcast measured his average four-seamer at 98.9 mph in both 2023 and 2024, while his sinker clocked in at an average of 97.7 mph in 2023 and is actually marginally better in 2024 at 97.8 mph.
That sinker has helped Soriano run up an elite ground-ball rate; his 60.1% grounder rate ranks third among the 145 big league pitchers with at least 50 innings pitched this year, trailing only Framber Valdez (61.4%) and Cristopher Sanchez (60.3%). That uptick in grounder rate over last year’s 51% mark correlates with a huge spike in Soriano’s sinker usage (13.3% in ’23, 40% in ’24). The extra sinker usage has come at the expense of some four-seamers (25.8% in ’23, 17.8% in ’24) and particularly Soriano’s knuckle curve (41.2% in ’23, 27.5% in ’24).
The tweak in repertoire could come down to a pursuit of efficiency as Soriano looks to work deeper into games. The right-hander fanned 30.3% of opponents last season and registered a hearty 14.8% swinging-strike rate but also required 16.6 pitches per inning pitched, on average. In 2024, his strikeout rate is down to 20.3% with a 10.2% swinging-strike rate. But he’s significantly upped his grounder rate and is now averaging just 15.1 pitches per frame. Soriano averaged 6 2/3 innings per start in the five appearances between our last check and this one, so it seems clear he’s placing an emphasis on being able to work deeper into games in his new role. Opponents are hitting .313/.421/.521 in 58 plate appearances when facing him a third time, so the results aren’t there so far, however.
Bryse Wilson, RHP, Brewers
Stats at quarter mark: 11 G (5 GS), 34 innings, 2.65 ERA (4.60 SIERA), 20.4 K%, 10.9 BB%, 39.1 GB%
Stats since: 9 G (4 GS), 44 innings, 5.52 ERA (4.27 SIERA), 17.6 K%, 6.7 BB%, 41.3 GB%
Wilson hasn’t technically “started” each of his past nine appearances, but he’s averaged five innings per outing while working as a starter and bulk reliever (on the heels of an opener). Effectively, the Brewers are using him as a starter — they’re just shielding him from the top-third of some lineups on occasion, when the matchup dictates.
This wasn’t a planned move to a longer role. The former Braves top prospect and Pirates hurler entered the season slated for a second straight season as Milwaukee’s long man, but injuries to Wade Miley, Joe Ross, Robert Gasser and DL Hall combined to not only push Wilson into this rotation-ish role but to keep him there. After pitching 76 2/3 innings of pure long relief in 2023, Wilson is already at 78 frames and counting.
As one would typically expect, Wilson’s fastball has taken a slight dip as he’s stretched out for longer stints. He averaged 94 mph through the season’s first quarter, but several of those earlier appearances were still in short relief. He’s averaging 93.2 mph since mid-May and has seen his strikeout rate drop but also seen his walk rate improve. As he’s been tasked with facing more lefties, Wilson has upped his changeup and cutter usage a bit, doing so at the expense of his four-seamer and curveball.
Wilson has been far too homer-prone this season (1.62 HR/9) and is giving up too much hard contact (45.8%, per Statcast). More so than any pitcher on this list, he’s run into troubles the third time through the order; in 45 such plate appearances, they’ve posted a Herculean .400/.467/.650 slash. Those plate appearances account for just 13.6% of Wilson’s batters faced this season but have resulted in 21.5% of his home runs allowed. Wilson seems best suited for a long relief role or a five-inning start/bulk role, but he’s pitched more than five innings six times this season and is giving Milwaukee some desperately needed innings when their rotation is in tatters.
A.J. Puk, LHP, Marlins
Stats at quarter mark: 4 GS, 13 2/3 innings, 9.22 ERA (7.13 SIERA), 15.6 K%, 22.1 BB%, 31.9 GB%
Stats since: 0 GS, 21 1/3 innings, 2.95 ERA (3.36 SIERA), 21.4 K%, 4.8 BB%, 44.3 GB%
The Marlins quickly pulled the plug on the Puk rotation experiment, and it’s worked out for all parties. The former No. 6 overall pick (A’s, 2016) turned heads as a starter in spring training but was shelled in what currently stand as the only four starts of his big league career (though Puk was a starter both for the University of Florida and in the minor leagues).
It’s unlikely that Puk would’ve continued to struggle quite so substantially had Miami continued using him as a starter, but the left-hander certainly looks more comfortable in the short relief role in which he thrived from 2022-23 (123 innings, 3.51 ERA, 19 saves, 22 holds, 29.4 K%, 6.9 BB%). He’s performing far better in his old role, and he required a three-week stint on the injured list for shoulder fatigue following his early start in the rotation.
There’s no reason to fault the Marlins for trying to stretch out a clearly talented reliever who has a track record in the rotation, but Puk is back in the bullpen and figures to draw attention over the next month from teams seeking left-handed bullpen help. He’s controllable through the 2026 season.
Tyler Alexander, LHP, Rays
Stats at quarter mark: 7 G (5 GS), 39 2/3 innings, 5.45 ERA (4.44 SIERA), 19.1 K%, 6.9 BB%, 30.4 GB%
Stats since: 3 G (1 GS), 17 innings, 7.94 ERA (3.68 SIERA), 20.3 K%, 1.4 BB%, 27.8 GB%
Alexander entered the season in the same type of role Wilson currently holds with the Brewers: occasional starter and frequent bulk reliever behind an opener. He made a handful of solid appearances early on, though the value of those was offset by some particularly rough outings versus the Yankees (six runs in seven innings) and the Royals (eight runs in five innings).
Following our last check-in, Alexander made three appearances before being optioned to Triple-A Durham, where he’s worked quite effectively out of the Bulls’ rotation: five starts, 29 2/3 innings, 3.64 ERA, 24.2% strikeout rate, 2.4% walk rate. That should position him as a depth option in the event of a big league injury and/or trade. Tampa Bay reportedly has considered fielding offers on current members of its big league rotation — Zack Littell and Aaron Civale, most notably. Part of that is due to the looming returns of Shane Baz and Jeffrey Springs, but Alexander gives them another rotation candidate who’s performed well recently in Durham.
The Rays haven’t abandoned the Alexander starting experiment, but for the time being he’s not in their big league rotation plans. Speculatively, that could make Alexander himself a trade option for teams seeking back-of-the-rotation depth, though if the Rays do ultimately move Littell, Civale or a more expensive arm like Zach Eflin, they may not want to deplete the rotation depth much further.
