ERA+
Kelvin Herrera · Season-by-season history
ERA+ over time
- Kansas City Royals · MLB
- Chicago White Sox · MLB
| Season | Team | League | ERA+ |
|---|---|---|---|
| 2020 |  Chicago White Sox |
MLB | 33 |
| 2019 | Chicago White Sox |
MLB | 75 |
| 2018 |  Kansas City Royals |
MLB | 416 |
| 2017 | Kansas City Royals |
MLB | 106 |
| 2016 | Kansas City Royals |
MLB | 157 |
| 2015 | Kansas City Royals |
MLB | 155 |
| 2014 | Kansas City Royals |
MLB | 280 |
| 2013 | Kansas City Royals |
MLB | 107 |
| 2012 | Kansas City Royals |
MLB | 178 |
| 2011 | Kansas City Royals |
MLB | 36 |