ERA
John Schreiber · Season-by-season history
ERA over time
- Detroit Tigers · MLB
- Boston Red Sox · MLB
- Kansas City Royals · MLB
| Season | Team | League | ERA |
|---|---|---|---|
| 2025 |  Kansas City Royals |
MLB | 3.80 |
| 2024 | Kansas City Royals |
MLB | 3.66 |
| 2023 |  Boston Red Sox |
MLB | 3.86 |
| 2022 | Boston Red Sox |
MLB | 2.22 |
| 2021 | Boston Red Sox |
MLB | 3.00 |
| 2020 |  Detroit Tigers |
MLB | 6.32 |
| 2019 | Detroit Tigers |
MLB | 6.23 |