Aaron Bummer career ERA
4.07Career Regular Season
Aaron Bummer has a career ERA of 4.07 over 10 regular seasons.
- Best season on file: 0.96 in 2020.
- Most recent: 10.26 in 2026.
Average of 10 regular seasons, 2017 through 2026. Figures come from ESPN's box scores and were last read on September 21, 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 |  CHW | 30 | 1 | 3 | 4.50 | 22.0 | 17 | 15 | 1.27 | 0 |
| 2018 | CHW | 37 | 0 | 1 | 4.26 | 31.2 | 35 | 10 | 1.58 | 0 |
| 2019 | CHW | 58 | 0 | 0 | 2.13 | 67.2 | 60 | 24 | 0.99 | 1 |
| 2020 | CHW | 9 | 1 | 0 | 0.96 | 9.1 | 14 | 5 | 1.07 | 0 |
| 2021 | CHW | 62 | 5 | 5 | 3.51 | 56.1 | 75 | 29 | 1.26 | 2 |
| 2022 | CHW | 32 | 2 | 1 | 2.36 | 26.2 | 30 | 10 | 1.50 | 2 |
| 2023 | CHW | 61 | 5 | 5 | 6.79 | 58.1 | 78 | 36 | 1.53 | 0 |
| 2024 |  ATL | 56 | 4 | 3 | 3.58 | 55.1 | 69 | 18 | 1.43 | 0 |
| 2025 | ATL | 42 | 3 | 2 | 3.81 | 54.1 | 51 | 17 | 1.25 | 0 |
| 2026 |  ATL/KC | 21 | 1 | 2 | 10.26 | 16.2 | 13 | 11 | 2.10 | 0 |
What the columns mean: W · L · ERA · IP · K · BB · WHIP · SV