| Rank | WAA | IP | ERA | Gs | Gr | Tm |
|---|---|---|---|---|---|---|
| +091+ | 1.82 | 25.7 | 1.05 | 0 | 27 | KCA |
| +091+ | 1.78 | 29.7 | 1.52 | 0 | 0 | TOT |
| +091+ | -0.04 | 4.0 | 4.50 | 0 | 4 | WAS |
| Date | Rank | WAA | TeamID |
|---|---|---|---|
| 20180418 | XXXXX | 0.45 | KCA |
| 20180502 | XXXXX | 0.81 | KCA |
| 20180516 | XXXXX | 1.11 | KCA |
| 20180530 | +070+ | 1.64 | KCA |
| 20180613 | +073+ | 1.82 | KCA |
| 20180627 | +092+ | 1.78 | WAS |
| 20180629 | +091+ | 1.78 | WAS |
| 20180706 | +113+ | 1.73 | WAS |
| 20180723 | +096+ | 2.02 | WAS |
| 20180806 | +107+ | 2.04 | WAS |
| 20180820 | +175+ | 1.66 | WAS |
| 20180903 | +170+ | 1.81 | WAS |
| 20180917 | +183+ | 1.80 | WAS |
| 20181001 | +194+ | 1.80 | WAS |
Kelvin Herrera Post Season Games
| Rank | WAA | IP | ERA | Gs | Gr | Tm |
|---|---|---|---|---|---|---|
| +118+ | 1.56 | 28.7 | 1.26 | 0 | 22 | KCA |
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