Players · F · Pitcher · 2026
Jack Flaherty
- Age
- 31
- B/T
- R/R
- Height
- 6' 4"
- Weight
- 225 lb
- Number
- #9
- Born
- October 15, 1995 in Burbank, CA, United States
- MLB debut
- September 1, 2017
- Drafted
- 2014, round 1
- High school
- Harvard-Westlake
- Salary, 2026
- $10M
- dbWAR
- 17.5 14 season(s)
- IP
- 86.1
- ERA
- 4.59
- FIP
- 4.10
- K/9
- 10.6
- FIP−
- 98 100 = avg
Jack Flaherty is a starting pitcher for the Detroit Tigers. In 2026 he struck out 102 batters over 86.1 innings across 19 appearances, 19 of them starts, going 3-8. His ERA of 4.59 is 9.8% higher than the league average of 4.18 — 16th of 20 on his team, and 354th of 538 among MLB pitchers with 20+ innings. Stripping out defence, his 4.10 FIP suggests he pitched better than his ERA shows. He missed bats on 27.1% of swings (12.2% of every pitch he threw), walked 10.8% of the batters he faced and struck out 26.2%. His 1.1 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.
WAR by season
Pitching
Standard and advanced, by season.
| Trend | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | DET | 19 | 19 | 86.1 | 3 | 8 | 0 | 80 | 44 | 102 | 42 | 4.59 | 4.10 | 1.41 | 10.6 | 4.4 | 110 | 98 | 1.1 | |
| 2025 | DET | 31 | 31 | 161.0 | 8 | 15 | 0 | 147 | 83 | 188 | 59 | 4.64 | 3.85 | 1.28 | 10.5 | 3.3 | 112 | 93 | 2.6 | |
| 2024 | DET/LAD | 28 | 28 | 162.0 | 13 | 7 | 0 | 135 | 57 | 194 | 38 | 3.17 | 3.48 | 1.07 | 10.8 | 2.1 | 78 | 85 | 3.1 | |
| 2023 | STL/BAL | 29 | 27 | 144.1 | 8 | 9 | 0 | 162 | 80 | 148 | 66 | 4.99 | 4.36 | 1.58 | 9.2 | 4.1 | 115 | 101 | 1.8 | |
| 2022 | STL | 9 | 8 | 36.0 | 2 | 1 | 0 | 36 | 17 | 33 | 22 | 4.25 | 4.97 | 1.61 | 8.3 | 5.5 | 107 | 125 | -0.0 | |
| 2021 | STL | 17 | 15 | 78.1 | 9 | 2 | 0 | 57 | 28 | 85 | 26 | 3.22 | 4.22 | 1.06 | 9.8 | 3.0 | 75 | 99 | 0.9 | |
| 2020 | STL | 9 | 9 | 40.1 | 4 | 3 | 0 | 33 | 22 | 49 | 16 | 4.91 | 4.11 | 1.21 | 10.9 | 3.6 | 110 | 92 | 0.7 | |
| 2019 | STL | 33 | 33 | 196.1 | 11 | 8 | 0 | 135 | 60 | 231 | 55 | 2.75 | 3.46 | 0.97 | 10.6 | 2.5 | 61 | 77 | 4.5 | |
| 2018 | STL | 28 | 28 | 151.0 | 8 | 9 | 0 | 108 | 56 | 182 | 59 | 3.34 | 3.86 | 1.11 | 10.8 | 3.5 | 80 | 93 | 2.2 | |
| 2017 | STL | 6 | 5 | 21.1 | 0 | 2 | 0 | 23 | 15 | 20 | 10 | 6.33 | 5.27 | 1.55 | 8.4 | 4.2 | 145 | 121 | -0.0 |
Batting
Standard and advanced, by season.
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 | 214 | 179 | 41 | 5 | 29 | 50 | .229 | .340 | .391 | .330 | 23.4% |
| vs RHB | 175 | 155 | 39 | 6 | 13 | 52 | .252 | .326 | .445 | .336 | 29.7% |
Pitch sequencing
What Jack Flaherty throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what Jack Flaherty throws in it.
Pitch arsenal
What he throws, how hard, how often it misses, and what hitters do with it.
| Four-Seam Fastball | 806 | 92.7 | 2,255 | 52.0% | 21.0% | 170 | .224 | .717 | |
| Slider | 397 | 85.0 | 2,439 | 44.3% | 32.0% | 89 | .281 | .854 | |
| Knuckle Curve | 321 | 78.1 | 2,401 | 43.9% | 37.6% | 60 | .250 | .762 | |
| Sinker | 73 | 90.9 | 2,061 | 27.4% | 24.0% | 12 | — | — | |
| Changeup | 42 | 85.4 | 1,815 | 21.4% | 27.3% | 3 | — | — |
Head to head
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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.