Skip to main content
MLB Deserve-to-Win
← All pitchers·All hitters

Sean Sullivan

2026
Rockies· LHP · throws L· 22.1 IP· 8.87 ERA· 2.01 WHIP· 114 batters faced
Compare

Grade

His grade shows how good he has been, and at what.
Fbetter than 3% of qualified pitchers at limiting bases
StarterStill Searching

Below league average across the board.

Sullivan allows more bases than most pitchers

The simulator expects him to allow 0.498 bases per batter faced, better than 3% of qualified pitchers. His weakest skill is getting strikeouts (10th percentile).

His grade rests on 114 batters faced, with data through 2026-09-27.

How to read this chart
Each spoke is a skill estimate adjusted for sample size, not a raw season stat, and farther out is better. A ↓ marks a stat where a lower number is better, and its spoke is flipped so farther out still means better. The middle ring marks the league median and the outer ring the league best. Percentiles compare him with 517 qualified pitchers, those with 100+ batters faced, starters and relievers together.

Plays like…

Each of these pitchers shares his archetype and sits closest to him in xEB/PA. Pick one to see him side by side with Sean Sullivan.

Simeon Woods RichardsonBlue JaysDrew PomeranzCubsRyan FeltnerRockiesConnor PhillipsReds

Pitcher type

This map shows what kind of pitcher he is, next to the league.

Pitcher type

He lands in the “Limits hard contact, pitches to contact” corner of the map.

League best:K% − BB% Jacob Misiorowski (26.8%)Hard-hit% allowed Blake Snell (29.0%)

How to read this chart
Two skills separate pitching styles: strikeout rate minus walk rate, where higher is better, and hard-hit rate allowed, where lower is better. The hard-hit axis is flipped, so the best corner is the top right. Each dot is a pitcher with 80+ batters faced this season, sized by batters faced. The dashed lines are the league median on each skill, and the league best on each is named above the chart. Click any dot to open that pitcher's page.
 Sean SullivanLeague medianPercentile
Bases per ball in play(lower = better).673.527—
Walk rate(lower = better)10%9%38th
Strikeout rate(higher = better)19%22%10th

A higher percentile is better, and the 99th is the top of the league.

Arsenal

These cards show what he throws and what each pitch does.

Sean Sullivan leans on his four-seam fastball (46% of pitches). No pitch has beaten league-average results yet, and the sweeper has come closest.

Pitch mix & swing-and-miss

−1 bases worse than a replacement arm this season

He allowed about 68 estimated bases, against a replacement arm's 67 over the same batters faced.

Replacement level is per-batter and can't be split by pitch type, so the bars below use league average.

All pitches

He cost 16.1 bases against league average across 388 pitches, or 4.1 per 100 pitches.

Four-Seam Fastball
46%
87.6 mph · LHP median 93.5
16% whiffs · Lg median 21%
cost 6.2 per 10011.8 total
Sweeper
18%
75.4 mph · LHP median 81.2
10% whiffs · Lg median 31%
cost 1.7 per 1001.2 total
Changeup
16%
77.1 mph · LHP median 85.1
22% whiffs · Lg median 30%
cost 2.4 per 1001.6 total
Cutter
15%
82.7 mph · LHP median 88.0
19% whiffs · Lg median 22%
cost 2.4 per 1001.5 total
Sinker
not charted
6%
86.6 mph · LHP median 92.9
—
—

His sinker isn't in the charts below, because only 24 of them were tracked with velocity and movement data this season.

How to read this chart
Each row is a pitch he throws at least 3% of the time, from pitch tracking in the regular season. The bar is how often he throws it, then its average velocity and its whiff rate, the share of swings that miss. Beside the velocity and the whiff rate is the median for that pitch, among pitchers of his hand for velocity and across the league for whiffs. More whiffs are better for a pitcher, while usage and velocity describe how he pitches. The Bases vs average bars score each pitch against a league-average pitch in the same count, and a bar to the left (saved) is better.

Mix by batter side

Four-Seam Fastball
45% vs LHH · LHP median 34%
46% vs RHH · LHP median 41%
Sweeper
23% vs LHH · LHP median 31%
15% vs RHH · LHP median 19%
How to read this chart
Each row shows how often he throws a pitch to left-handed hitters (LHH) and right-handed hitters (RHH), next to the median for pitchers of his hand (LHP median). Medians come from left-handed pitchers who throw that pitch at least 3% of the time. Between 55 and 149 of them qualify, depending on the pitch. A mix is a plan, so a higher or lower share is neither better nor worse. Overall results by batter side are under Platoon splits.

By appearance

These charts follow his velocity, movement and mix from outing to outing.

These charts follow his velocity, movement and pitch mix one outing at a time, and each pitch keeps the same color in every chart. The velocity and movement charts also shade the middle of the league for scale. His sinker isn't in these charts, because only 24 of them were tracked with velocity and movement data this season.

Platoon splits

This section splits his results against lefties and righties.

Platoon splits (EB/PA allowed)

He handles lefty bats better than righty bats, by 0.038 EB/PA allowed.

50% probable range: +0.029 to +0.047

vs LHB37 PA0.488

vs LHB: shrunk estimate 0.488 EB/PA, 50% probable range 0.467 to 0.511, based on 37 plate appearances. Raw (unshrunk) rate: 0.630 EB/PA. League median vs LHB: 0.451 EB/PA.

His raw rate vs LHB (0.630) is off this scale. Small samples can push a raw rate this far, which is why the dot, the shrunk estimate, is the number to trust.

vs RHB77 PA0.526

vs RHB: shrunk estimate 0.526 EB/PA, 50% probable range 0.505 to 0.548, based on 77 plate appearances. Raw (unshrunk) rate: 0.613 EB/PA. League median vs RHB: 0.435 EB/PA.

His raw rate vs RHB (0.613) is off this scale. Small samples can push a raw rate this far, which is why the dot, the shrunk estimate, is the number to trust.

0.4210.4560.4910.5260.561
← betterworse →
Below league medianAbove50% probable rangeHis raw rateMiddle half of the league

His split is about typical for a lefty arm (median 0.038). He allows more than the league median against both sides.

How to read this chart
  • Each dot is his estimate against that side, with its 50% probable range as the bar. These are bases allowed, so lower is better.
  • The diamond is his raw rate, which small samples make noisy, so the simulator pulls the dot toward a more trustworthy value.
  • The dashed tick is the league median, and the shaded strip is the middle half of pitchers with 100 or more batters faced.
  • The two splits average back to his modeled overall EB/PA allowed, not the xEB/PA headline.
  • Tap or hover a mark for its number. LHB and RHB are left- and right-handed batters. More on the About page

Contact allowed

These cards show what hitters do when they make contact.

Batters go to the pull side off him most often, and that's also where they do the most damage.

Pull side and opposite field depend on which side each batter hits from, so this pools every hitter he faced.

Batted balls allowed

Every ball hit off Sean Sullivan this season is drawn where it landed.
hit · out
EBlowhigh
vs Bryce EldridgeHome run
107 mph · 30° · worth 3.8 bases
07/04 vs Giants
vs Willy AdamesDouble
96 mph · 28° · worth 3.3 bases
07/04 vs Giants
vs Wilyer AbreuHome run
103 mph · 34° · worth 3.2 bases
06/23 vs Red Sox
vs Otto LopezHome run
100 mph · 31° · worth 3.1 bases
06/29 vs Marlins
vs Bryce EldridgeDouble
104 mph · 33° · worth 2.5 bases
07/04 vs Giants

Luck check

3 outs behind him came on balls the simulator values at 1.5 bases or more.

vs Connor WongOutLucky out
105 mph · 21° · worth 2.2 bases
06/23 vs Red Sox
How to read this chart
Dot color is estimated bases (EB), what the contact was worth no matter what the defense did with it. Darker means more bases, so a dark hollow ring in the outfield is a crushed ball his defense ran down. Tap or hover a dot or a row to link the two, and use the ▶ links to watch a play on Baseball Savant.

Deserved vs. actual

Batters have been credited with about 11 more bases than their contact off Sean Sullivan deserved, so his results have been unlucky so far.

Deserved by the contact he allowed57
Actually credited to batters67

Both bars count 84 balls in play, with walks and strikeouts left out.

How to read this chart
Every ball in play is worth the bases its exit velocity, launch angle and direction usually produce. If batters were credited with more than that, his results have been unlucky, and fewer means lucky. BABIP against is the batting average on balls in play he allows, next to the league median.

ERA 8.87 · WHIP 2.01 · BABIP against 0.367 (Lg median 0.286)

Best games

These are his biggest outings this season.

Best games

These are his best outings this season, ranked by bases saved against a replacement arm.