Players · S · Pitcher · 2026
Sean Sullivan
- Age
- 24
- B/T
- R/L
- Height
- 6' 4"
- Weight
- 200 lb
- Number
- #45
- Born
- July 22, 2002 in Boston, MA, United States
- MLB debut
- June 12, 2026
- Drafted
- 2023, round 2
- College
- Wake Forest
- dbWAR
- -.3 1 season(s)
- IP
- 22.1
- ERA
- 8.87
- FIP
- 6.46
- K/9
- 6.4
- FIP−
- 155 100 = avg
Sean Sullivan is a starting pitcher for the Colorado Rockies. In 2026 he struck out 16 batters over 22.1 innings across 5 appearances, 5 of them starts, going 0-3. His ERA of 8.87 is 112.2% higher than the league average of 4.18 — the worst on his team, and the second worst among MLB pitchers with 20+ innings. Stripping out defence, his 6.46 FIP suggests he pitched better than his ERA shows. He missed bats on 16.2% of swings (7.8% of every pitch he threw), walked 9.6% of the batters he faced and struck out 14.0%. His -0.3 dbWAR is built from that FIP rather than runs allowed, so it credits him for what he controls and not for the defence behind him.
League context
Percentile among qualified pitchers, 2026.
Pitching
Standard and advanced, by season.
| Trend | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | COL | 5 | 5 | 22.1 | 0 | 3 | 0 | 34 | 22 | 16 | 11 | 8.87 | 6.46 | 2.01 | 6.4 | 4.4 | 212 | 155 | -0.3 | — |
Platoon splits
How left- and right-handed hitters fare against him.
| Split | PA | AB | H | HR | BB | SO | AVG | OBP | SLG | wOBA | K% |
|---|---|---|---|---|---|---|---|---|---|---|---|
| vs LHB | 37 | 33 | 12 | 3 | 3 | 6 | .364 | .432 | .758 | .500 | 16.2% |
| vs RHB | 77 | 66 | 22 | 2 | 8 | 10 | .333 | .416 | .636 | .445 | 13.0% |
Pitch sequencing
What Sean Sullivan throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what Sean Sullivan throws in it.
Pitch arsenal
What he throws, how hard, how often it misses, and what hitters do with it.
| Four-Seam Fastball | 189 | 87.6 | 2,256 | 49.7% | 15.7% | 43 | .419 | 1.333 | |
| Sweeper | 72 | 75.4 | 2,330 | 45.8% | 9.7% | 17 | .412 | 1.209 | |
| Changeup | 65 | 77.1 | 1,675 | 30.8% | 22.2% | 24 | .208 | .686 | |
| Cutter | 62 | 82.7 | 2,286 | 46.8% | 19.4% | 9 | — | — | |
| Sinker | 24 | 86.6 | 2,260 | 45.8% | 10.0% | 6 | — | — |
Head to head
Put Sean Sullivan beside up to three others.
Similar players
Nearest 2026 seasons by command, run prevention and role, on rate statistics rather than totals.
wOBA uses linear weights measured from this season's own play-by-play rather than published constants, and wRC+ is park-adjusted against that same league. dbWAR is our own open implementation — not fWAR or bWAR — and the full derivation, including its simplifications, is on the methodology page.