Kelvin Herrera played 10 seasons for the Royals, White Sox and Nationals. He had 27 wins, 32 losses, 61 saves, an ERA of 3.21 and 510 strikeouts. He won 1 World Series.
| NAME | SEASON | TM | G | W | L | W% | GS | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | K/9 | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | ERA- | FIP | FIP- | H/9 | PRAA | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | K. Herrera | 2011 |  KCR | 2 | 0 | 1 | .000 | 0 | 13.50 | 0 | 0 | 0 | 0 | 2.0 | 2 | 3 | 3 | 1 | 0 | 1 | 0 | 0 | 9 | 0 | 0.00 | 0.00 | 4.50 | 0.0 | 0.0 | 1.00 | .143 | 13.50 | 325 | 11.02 | 275 | 9.00 | -1.6 | |
| 2 | | K. Herrera | 2012 | KCR | 76 | 4 | 3 | .571 | 0 | 2.35 | 77 | 0 | 0 | 3 | 84.1 | 79 | 22 | 24 | 4 | 21 | 2 | 10 | 6 | 344 | 3 | 8.22 | 2.24 | 3.67 | 0.43 | 22.4 | 6.1 | 1.19 | .313 | 2.56 | 57 | 2.70 | 66 | 8.43 | 13.1 |
| 3 | | K. Herrera | 2013 | KCR | 59 | 5 | 7 | .417 | 0 | 3.86 | 74 | 0 | 0 | 2 | 58.1 | 48 | 25 | 27 | 9 | 21 | 2 | 16 | 2 | 245 | 5 | 11.42 | 3.24 | 3.52 | 1.39 | 30.2 | 8.6 | 1.18 | .281 | 4.17 | 96 | 3.69 | 94 | 7.41 | 1.5 |
| 4 | | K. Herrera | 2014 | KCR | 70 | 4 | 3 | .571 | 0 | 1.41 | 59 | 0 | 0 | 0 | 70.0 | 54 | 11 | 12 | 0 | 26 | 3 | 12 | 0 | 285 | 1 | 7.59 | 3.34 | 2.27 | 0.00 | 20.7 | 9.1 | 1.14 | .274 | 1.54 | 36 | 2.68 | 72 | 6.94 | 8.3 |
| 5 | | K. Herrera | 2015 | KCR | 72 | 4 | 3 | .571 | 0 | 2.71 | 64 | 0 | 0 | 0 | 69.2 | 52 | 21 | 23 | 5 | 26 | 2 | 8 | 1 | 286 | 4 | 8.27 | 3.36 | 2.46 | 0.65 | 22.4 | 9.1 | 1.12 | .249 | 2.97 | 66 | 3.43 | 87 | 6.72 | 4.1 |
| 6 | | K. Herrera | 2016 | KCR | 72 | 2 | 6 | .250 | 0 | 2.75 | 86 | 0 | 0 | 12 | 72.0 | 57 | 22 | 23 | 6 | 12 | 3 | 23 | 0 | 283 | 3 | 10.75 | 1.50 | 7.17 | 0.75 | 30.4 | 4.2 | 0.96 | .290 | 2.88 | 65 | 2.46 | 59 | 7.13 | 13.8 |
| 7 | | K. Herrera | 2017 | KCR | 64 | 3 | 3 | .500 | 0 | 4.25 | 56 | 0 | 0 | 26 | 59.1 | 60 | 28 | 33 | 9 | 20 | 1 | 48 | 2 | 259 | 2 | 8.49 | 3.03 | 2.80 | 1.37 | 21.6 | 7.7 | 1.35 | .295 | 5.01 | 95 | 4.30 | 100 | 9.10 | 0 |
| 8 | | K. Herrera | 2018 | TOT | 48 | 2 | 3 | .400 | 0 | 2.44 | 38 | 0 | 0 | 17 | 44.1 | 43 | 12 | 12 | 6 | 10 | 1 | 32 | 0 | 183 | 0 | 7.71 | 2.03 | 3.80 | 1.22 | 20.8 | 5.5 | 1.20 | .289 | 2.44 | 59 | 3.94 | 95 | 8.73 | 1.1 |
| 9 | | K. Herrera | 2019 |  CWS | 57 | 3 | 3 | .500 | 0 | 6.14 | 53 | 0 | 0 | 1 | 51.1 | 60 | 35 | 36 | 8 | 23 | 1 | 16 | 6 | 235 | 8 | 9.29 | 4.03 | 2.30 | 1.40 | 22.6 | 9.8 | 1.62 | .347 | 6.31 | 135 | 4.57 | 97 | 10.52 | 0.8 |
| 10 | | K. Herrera | 2020 | CWS | 2 | 0 | 0 | 0 | 15.43 | 3 | 0 | 0 | 0 | 2.1 | 3 | 4 | 4 | 2 | 1 | 0 | 1 | 0 | 11 | 0 | 11.57 | 3.86 | 3.00 | 7.71 | 27.3 | 9.1 | 1.71 | .200 | 15.43 | 345 | 13.04 | 282 | 11.57 | -2.1 | |
| Total | 522 | 27 | 32 | .458 | 0 | 3.21 | 510 | 0 | 0 | 61 | 513.2 | 458 | 183 | 197 | 50 | 160 | 16 | 166 | 17 | 2,140 | 26 | 8.94 | 2.80 | 3.19 | 0.88 | 23.8 | 7.5 | 1.20 | .291 | 3.45 | 76 | 3.43 | 83 | 8.02 | 39 |
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