ERA
Kenley Jansen · Season-by-season history
ERA over time
- Boston Red Sox · MLB
- Los Angeles Angels · MLB
Hover over a point for its value. Only numeric values with a recorded season are charted; missing seasons are not treated as zero.
| Season | Team | League | ERA |
|---|---|---|---|
| 2025 |  Los Angeles Angels |
MLB | 2.59 |
| 2024 |  Boston Red Sox |
MLB | 3.29 |
| 2023 | Boston Red Sox |
MLB | 3.63 |