Max Scherzer had the best ERA for the Nationals with more than 50.0 innings pitched in 2021, with an ERA of 2.76.
| NAME | ERA | IP | SEASON | TM | G | W | L | 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 |  | M. Scherzer | 2.76 | 111.0 | 2021 |  WSH | 19 | 8 | 4 | .667 | 19 | 147 | 1 | 0 | 0 | 71 | 34 | 36 | 18 | 28 | 8 | 0 | 0 | 428 | 0 | 11.92 | 2.27 | 5.25 | 1.46 | 34.3 | 6.5 | 0.89 | .233 | 2.92 | 66 | 3.59 | 84 | 5.76 | 8.4 |
| 2 |  | K. Finnegan | 3.55 | 66.0 | 2021 | WSH | 68 | 5 | 9 | .357 | 0 | 68 | 0 | 0 | 11 | 64 | 26 | 39 | 9 | 34 | 2 | 24 | 4 | 294 | 8 | 9.27 | 4.64 | 2.00 | 1.23 | 23.1 | 11.6 | 1.48 | .304 | 5.32 | 85 | 4.51 | 105 | 8.73 | -1.6 |
| 3 | | J. Ross | 4.17 | 108.0 | 2021 | WSH | 20 | 5 | 9 | .357 | 19 | 109 | 0 | 0 | 0 | 98 | 50 | 57 | 17 | 34 | 8 | 0 | 4 | 460 | 0 | 9.08 | 2.83 | 3.21 | 1.42 | 23.7 | 7.4 | 1.22 | .277 | 4.75 | 99 | 4.36 | 102 | 8.17 | -0.8 |
| 4 | | P. Espino | 4.27 | 109.2 | 2021 | WSH | 35 | 5 | 5 | .500 | 19 | 92 | 0 | 0 | 1 | 108 | 52 | 53 | 19 | 25 | 1 | 11 | 2 | 455 | 1 | 7.55 | 2.05 | 3.68 | 1.56 | 20.2 | 5.5 | 1.21 | .280 | 4.35 | 102 | 4.45 | 104 | 8.86 | -2 |
| 5 |  | J. Lester | 5.02 | 75.1 | 2021 | WSH | 16 | 3 | 5 | .375 | 16 | 51 | 0 | 0 | 0 | 91 | 42 | 50 | 14 | 29 | 1 | 0 | 3 | 342 | 0 | 6.09 | 3.46 | 1.76 | 1.67 | 14.9 | 8.5 | 1.59 | .312 | 5.97 | 120 | 5.42 | 127 | 10.87 | -9.4 |
| 6 |  | J. Gray | 5.31 | 62.2 | 2021 | WSH | 12 | 2 | 2 | .500 | 12 | 63 | 0 | 0 | 0 | 56 | 37 | 38 | 15 | 28 | 2 | 0 | 2 | 272 | 6 | 9.05 | 4.02 | 2.25 | 2.15 | 23.2 | 10.3 | 1.34 | .250 | 5.46 | 127 | 5.70 | 133 | 8.04 | -9.7 |
| 7 | | A. Voth | 5.34 | 57.1 | 2021 | WSH | 49 | 4 | 1 | .800 | 1 | 59 | 0 | 0 | 0 | 57 | 34 | 35 | 10 | 28 | 1 | 8 | 5 | 248 | 1 | 9.26 | 4.40 | 2.11 | 1.57 | 23.8 | 11.3 | 1.48 | .313 | 5.49 | 127 | 4.89 | 114 | 8.95 | -3.8 |
| 8 | | E. Fedde | 5.47 | 133.1 | 2021 | WSH | 29 | 7 | 9 | .438 | 27 | 128 | 0 | 0 | 0 | 144 | 81 | 90 | 23 | 48 | 4 | 1 | 6 | 590 | 1 | 8.64 | 3.24 | 2.67 | 1.55 | 21.7 | 8.1 | 1.44 | .313 | 6.07 | 130 | 4.65 | 109 | 9.72 | -5.4 |
| 9 |  | P. Corbin | 5.82 | 171.2 | 2021 | WSH | 31 | 9 | 16 | .360 | 31 | 143 | 0 | 0 | 0 | 192 | 111 | 114 | 37 | 60 | 3 | 0 | 2 | 751 | 0 | 7.50 | 3.15 | 2.38 | 1.94 | 19.0 | 8.0 | 1.47 | .305 | 5.98 | 139 | 5.40 | 126 | 10.07 | -21 |
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