ERA+
Danny Duffy · Season-by-season history
ERA+ over time
- Kansas City Royals · MLB
| Season | Team | League | ERA+ |
|---|---|---|---|
| 2021 |  Kansas City Royals |
MLB | 182 |
| 2020 | Kansas City Royals |
MLB | 94 |
| 2019 | Kansas City Royals |
MLB | 110 |
| 2018 | Kansas City Royals |
MLB | 89 |
| 2017 | Kansas City Royals |
MLB | 117 |
| 2016 | Kansas City Royals |
MLB | 123 |
| 2015 | Kansas City Royals |
MLB | 102 |
| 2014 | Kansas City Royals |
MLB | 156 |
| 2013 | Kansas City Royals |
MLB | 226 |
| 2012 | Kansas City Royals |
MLB | 108 |
| 2011 | Kansas City Royals |
MLB | 73 |