Jack Flaherty career ERA
3.86Career Regular Season
Jack Flaherty has a career ERA of 3.86 over 10 regular seasons.
- Best season on file: 2.75 in 2019.
- Most recent: 4.59 in 2026.
Average of 10 regular seasons, 2017 through 2026. Figures come from ESPN's box scores and were last read on September 22, 2026.
| GP: Games the player appeared in, however briefly. | W: Games in which this pitcher was credited with the win. | L: Games in which this pitcher was charged with the loss. | ERA: Earned runs allowed per nine innings pitched — lower is better. Under 3.00 is excellent. | IP: Innings pitched. The decimal counts outs, so 6.2 is six innings and two more outs. | K: Batters this pitcher struck out. | BB: Times the batter reached first base on four balls. | WHIP: Walks and hits allowed per inning pitched — lower is better. Around 1.00 is elite. | SV: Games finished by protecting a narrow lead to the last out. | ||
|---|---|---|---|---|---|---|---|---|---|---|
| 2017 |  STL | 6 | 0 | 2 | 6.33 | 21.1 | 20 | 10 | 1.55 | 0 |
| 2018 | STL | 28 | 8 | 9 | 3.34 | 151.0 | 182 | 59 | 1.11 | 0 |
| 2019 | STL | 39 | 11 | 8 | 2.75 | 196.1 | 231 | 55 | 0.97 | 0 |
| 2020 | STL | 9 | 4 | 3 | 4.91 | 40.1 | 49 | 16 | 1.21 | 0 |
| 2021 | STL | 17 | 9 | 2 | 3.22 | 78.1 | 85 | 26 | 1.06 | 0 |
| 2022 | STL | 9 | 2 | 1 | 4.25 | 36.0 | 33 | 22 | 1.61 | 0 |
| 2023 |  STL/BAL | 29 | 8 | 9 | 4.99 | 144.1 | 148 | 66 | 1.58 | 0 |
| 2024 |  DET/LAD | 28 | 13 | 7 | 3.17 | 162.0 | 194 | 38 | 1.07 | 0 |
| 2025 |  DET | 31 | 8 | 15 | 4.64 | 161.0 | 188 | 59 | 1.28 | 0 |
| 2026 | DET | 19 | 3 | 8 | 4.59 | 86.1 | 102 | 42 | 1.41 | 0 |
What the columns mean: W · L · ERA · IP · K · BB · WHIP · SV