Join us for the Minor Pitcher Deal Extravaganza

It’s been dark here at FanGraphs for a few days, so admit it — you’re desperate to read anything right now. How about a roundup of analysis on three pitchers that went off the market right before our holiday hiatus?

Griffin Canning, Michael Soroka, and Patrick Sandoval all fit somewhere between the back of their new team’s rotation or the front of its starter depth; each received deals commensurate with those expectations. If the going rate for a fourth starter these days is something like $15 million AAV (Alex Cobb got one year and $15 million, Matthew Boyd got two years and $29 million), this trio is probably one tier below that.

Do these three signings, grouped together, mean anything in particular? Probably not. Each year, the starter/reliever binary grows blurrier, and perhaps someday, every pitcher will throw exactly three innings and the distinction will disappear completely. Perhaps each of these signings brings us closer to that day; Soroka, in particular, seems best served to go through a lineup once and then head out on his way. For various reasons, the expectation for all of these pitchers should be somewhere in the 80- to 120-inning range for the 2025 season. But for now, no further trends will be drawn. Without further ado, here is the lowdown on the three hurlers.

Griffin Canning

Canning drew some attention on the pitching nerd internet earlier this year due to the remarkably unremarkable shape of his fastball. The image below is courtesy of Max Bay’s dynamic dead zone app:

the deadest zone. cc: @choice_fielder https://t.co/3pkdXbfXhA pic.twitter.com/krJWXKN4yN

— Alex “Oxlade” Chamberlain (@DolphHauldhagen) October 31, 2024

Because Canning throws his fastball from a roughly league-average arm angle (45°), a league-average release height (5.8 feet), and with league-average ride (16.2 inches of induced vertical break), the pitch — in theory! — moves on a trajectory that hitters expect. (I say “in theory” because, as Remi Bunikiewicz pointed out, Canning does a great job hiding his fastball during the windup, complicating any perceptive analysis.)

This fastball was the bane of Canning’s existence in 2024. He did qualify for the ERA title, something only 57 other pitchers could claim they did, but his 5.26 FIP was worst among those qualified starters, and his strikeout rate was third worst. That strikeout rate dropped nearly eight percentage points from 2023 to 2024, and the performance against his fastball explained essentially all of that drop. The whiff rate on Canning’s three other primary pitches stayed virtually the same; on the fastball, the percentage of swings that resulted in misses went from 28% in 2023 to just 14% in 2024.

A drop in velocity appears to be the main culprit for the decline in performance. The four-seamer averaged 94.7 mph in 2023; that dipped to 93.4 mph in 2024. Could a 1.5-mph difference in velocity be the entire explanation? I’m inclined to think that the answer is mostly yes. But it’s also possible that the decline in slider quality impacted batter performance against his fastball. Canning’s death ball slider dropped three fewer inches relative to 2023, reducing the separation between his fastball and his primary out pitch against right-handed hitters.

Could a reduced role help Canning return to his prior form? These considerations could be part of the plan. The Mets employ something like eight starters; Canning sits outside the favored five. Assuming perfect health, it’s likely that they will deploy him in two- or three-inning bursts, perhaps allowing him to get back to that mid-90s velocity on the heater. Even in a swingman role, the $4.25 million contract makes good sense — with fewer workload responsibilities, it doesn’t feel unreasonable to expect Canning to deliver something like a 4.00 ERA over 100ish innings. And if injuries do strike the rotation, he can stretch out to a starter’s workload. Either way, there’s a role to play in this era where quality innings can be difficult to come by, especially in the late summer months.

Michael Soroka

Soroka exploded after a midseason move to the White Sox bullpen. As a reliever, Soroka struck out 39% of the hitters he faced, which would’ve ranked second in all of baseball.

Curiously, this wasn’t a case of Soroka ramping up the stuff over 15-pitch spurts. Unlike those pitchers topping the strikeout leaderboards — Mason Miller, Edwin Díaz, Josh Hader — Soroka did it mostly in chunky multi-inning appearances. Soroka pitched 36 innings out of the bullpen; all but 5 2/3 of them came in appearances that spanned two innings or more. In those slightly shorter appearances — he averaged nearly five innings per appearance as a starter and 2 1/3 as a reliever — the strikeout rate somehow tripled.

After moving full-time to relief work, Soroka added 1.5 mph to his four-seam fastball. But the four-seamer isn’t anything special; instead, at 94 mph with dead zone-ish movement, it’s mostly there to set up the slider, which generated nearly a 42% whiff rate.

What’s so special about the slider? It isn’t the velocity — it averages just 82.2 mph, well below the average for major league sliders. But its shape is distinct. There are slower curveballs that resemble the movement profile, but outside of Bryan Abreu, nobody really throws a slider with the combination of depth and sweep that Soroka manages to get. Starting May 18, when Soroka shifted to a bullpen role, the slider averaged -4.5 inches of induced vertical break with 5.2 inches of sweep, moving sharply on two planes.

But averages obscure the full truth. Soroka can also manipulate the pitch to move in a variety of break patterns. Look at the range of movement profiles on his slider, seen in yellow on his pitch plot below:

Soroka can firm it up, throwing it more like a gyro slider at 84 mph with zero inches of induced vertical break:

But he can also bend it like a curveball, dropping over 10 inches more than his firmest sliders:

(Look at poor Spencer Torkelson there — I think he was expecting the gyro.)

Between the identical frequency of the fastball and slider, the distinct two-plane movement profile, and the diversity of potential shapes, Soroka had batters swinging and missing more than almost any pitcher in baseball.

Evidently, the Nationals, who gave Soroka $9 million on a one-year deal, plan to use him as a “starter.” Given his usage patterns as a reliever, I’m not exactly sure what that means. I would expect that the Nationals will tell Soroka to let it loose for 60 or so pitches, just as he did in Chicago, and he’ll take on 12 or 13 hitters in a game. Like Canning, I think Soroka will end up closer to 90 innings than 180, letting his best stuff cook in outings that sit somewhere between a one-inning shutdown reliever and a starter trying to turn the lineup over three times.

Patrick Sandoval

Sandoval, who signed a two-year, $18.25 million deal with the Red Sox, is a perfect fit for their “no fastballs” organizational philosophy. This guy hates four-seamers now — they made up just 16% of his pitches in his injury-shortened 2024 campaign, by far a career low. Regardless of batter handedness, Sandoval mixes in all six of his pitches, but he works them in differently depending on whether he’s facing a righty or lefty. A plurality of his pitches to righties were changeups; to lefties, Sandoval spammed his slider and sweeper over half the time.

As one would expect with a pitcher who throws all that junk, Sandoval struggles to get the ball in the strike zone. He ran a 10% walk rate last year; even in his excellent 2022 campaign, in which he racked up 3.7 WAR, his walk rate was above 9%. The walks are just part of the package with Sandoval, but the hope is that at his best, he can pitch around them, striking out enough hitters and staying off enough barrels with his diverse pitch mix and refusal to throw anything straight.

Sandoval is likely to pitch the fewest innings of this trio in 2025. He tore his UCL and was shut down in mid-June before undergoing Tommy John surgery, so he’ll miss a big chunk of the upcoming season. When he returns, it figures that he will assume a traditional starter’s workload, though following the Walker Buehler signing, Boston’s rotation looks pretty packed. Ultimately, this deal is mostly a 2026 play, with some nice depth for the end of next year as a bonus.

Conclusion

None of these guys is too exciting. All of them have stanky fastballs. But each has a reason to believe that he might contribute surplus value on a modest deal. In the end, that’s what a minor pitcher signing is all about.