Patrick Corbin has played the most seasons for the Nationals with 150.0+ innings pitched with an ERA of 5.00 or worse, with 4 seasons.
| NAME | SEAS | IP | ERA | L | W | L% | G | W% | GS | SO | CG | SHO | SV | 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 |  | P. Corbin | 4 | 679.0 | 5.71 | 63 | 31 | .670 | 126 | .330 | 126 | 534 | 1 | 0 | 0 | 820 | 431 | 460 | 122 | 220 | 17 | 0 | 4 | 3,018 | 11 | 7.08 | 2.92 | 2.43 | 1.62 | 17.7 | 7.3 | 1.53 | .328 | 6.10 | 137 | 4.98 | 118 | 10.87 | -57.2 |
| 2 |  | J. Vazquez | 2 | 327.0 | 5.56 | 23 | 14 | .622 | 59 | .378 | 58 | 252 | 3 | 1 | 0 | 350 | 202 | 219 | 51 | 120 | 15 | 1 | 6 | 1,431 | 4 | 6.94 | 3.30 | 2.10 | 1.40 | 17.6 | 8.4 | 1.44 | .301 | 6.03 | 127 | 4.85 | 109 | 9.63 | -14.6 |
| 3 |  | T. Armas | 1 | 154.0 | 5.03 | 12 | 9 | .571 | 30 | .429 | 30 | 97 | 0 | 0 | 0 | 167 | 86 | 96 | 19 | 64 | 13 | 0 | 7 | 693 | 6 | 5.67 | 3.74 | 1.52 | 1.11 | 14.0 | 9.2 | 1.50 | .296 | 5.61 | 117 | 4.98 | 114 | 9.76 | -10.7 |
| 4 | | R. Ortiz | 1 | 190.2 | 5.57 | 16 | 11 | .593 | 33 | .407 | 33 | 104 | 0 | 0 | 0 | 230 | 118 | 127 | 31 | 64 | 18 | 0 | 14 | 871 | 4 | 4.91 | 3.02 | 1.63 | 1.46 | 11.9 | 7.3 | 1.54 | .304 | 5.99 | 129 | 5.45 | 124 | 10.86 | -23.5 |
| 5 | | J. Bullinger | 1 | 155.1 | 5.56 | 12 | 7 | .632 | 36 | .368 | 25 | 87 | 2 | 2 | 0 | 165 | 96 | 106 | 17 | 74 | 12 | 4 | 5 | 697 | 7 | 5.04 | 4.29 | 1.18 | 0.98 | 12.5 | 10.6 | 1.54 | .292 | 6.14 | 132 | 5.06 | 121 | 9.56 | -15.3 |
| 6 | | R. Grimsley | 1 | 151.1 | 5.35 | 9 | 10 | .474 | 32 | .526 | 27 | 42 | 2 | 0 | 0 | 199 | 90 | 102 | 18 | 41 | 3 | 2 | 1 | 678 | 2 | 2.50 | 2.44 | 1.02 | 1.07 | 6.2 | 6.0 | 1.59 | .315 | 6.07 | 146 | 4.58 | 124 | 11.83 | -15.4 |
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