| Rank | WAA | IP | ERA | Gs | Gr | Tm |
|---|---|---|---|---|---|---|
| +157+ | 1.90 | 25.7 | 1.05 | 0 | 27 | KCA |
| +157+ | 1.76 | 43.7 | 2.47 | 0 | 0 | TOT |
| +157+ | -0.14 | 18.0 | 4.50 | 0 | 20 | 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 |
| 20180711 | +106+ | 1.85 | WAS |
| 20180728 | +107+ | 1.96 | WAS |
| 20180811 | +163+ | 1.65 | WAS |
| 20180821 | +157+ | 1.76 | 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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