Max Scherzer and Jordan Zimmermann were tied for starting the most games for the Nationals in 2015, with 33 starts.
| NAME | GS | SEASON | TM | G | W | L | W% | 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 |  | M. Scherzer | 33 | 2015 |  WSH | 33 | 14 | 12 | .538 | 2.79 | 276 | 4 | 3 | 0 | 228.2 | 176 | 71 | 74 | 27 | 34 | 5 | 0 | 2 | 899 | 10 | 10.86 | 1.34 | 8.12 | 1.06 | 30.7 | 3.8 | 0.92 | .268 | 2.91 | 71 | 2.76 | 72 | 6.93 | 27.6 |
| 2 |  | J. Zimmermann | 33 | 2015 | WSH | 33 | 13 | 10 | .565 | 3.66 | 164 | 0 | 0 | 0 | 201.2 | 204 | 82 | 89 | 24 | 39 | 8 | 0 | 3 | 831 | 2 | 7.32 | 1.74 | 4.21 | 1.07 | 19.7 | 4.7 | 1.20 | .302 | 3.97 | 93 | 3.75 | 98 | 9.10 | 2 |
| 3 | | G. Gonzalez | 31 | 2015 | WSH | 31 | 11 | 8 | .579 | 3.79 | 169 | 0 | 0 | 0 | 175.2 | 181 | 74 | 79 | 8 | 69 | 4 | 0 | 3 | 758 | 4 | 8.66 | 3.54 | 2.45 | 0.41 | 22.3 | 9.1 | 1.42 | .341 | 4.05 | 96 | 3.04 | 79 | 9.27 | 15.6 |
| 4 |  | S. Strasburg | 23 | 2015 | WSH | 23 | 11 | 7 | .611 | 3.46 | 155 | 0 | 0 | 0 | 127.1 | 115 | 49 | 56 | 14 | 26 | 3 | 0 | 0 | 523 | 4 | 10.96 | 1.84 | 5.96 | 0.99 | 29.6 | 5.0 | 1.11 | .311 | 3.96 | 88 | 2.80 | 73 | 8.13 | 14.7 |
| 5 | | D. Fister | 15 | 2015 | WSH | 25 | 5 | 7 | .417 | 4.19 | 63 | 0 | 0 | 1 | 103.0 | 120 | 48 | 56 | 14 | 24 | 6 | 2 | 3 | 449 | 1 | 5.50 | 2.10 | 2.63 | 1.22 | 14.0 | 5.3 | 1.40 | .310 | 4.89 | 106 | 4.54 | 118 | 10.49 | -8.2 |
| 6 | | J. Ross | 13 | 2015 | WSH | 16 | 5 | 5 | .500 | 3.64 | 69 | 0 | 0 | 0 | 76.2 | 64 | 31 | 33 | 7 | 21 | 2 | 1 | 0 | 314 | 1 | 8.10 | 2.47 | 3.29 | 0.82 | 22.0 | 6.7 | 1.11 | .265 | 3.87 | 92 | 3.41 | 89 | 7.51 | 3.6 |
| 7 | | T. Roark | 12 | 2015 | WSH | 40 | 4 | 7 | .364 | 4.38 | 70 | 0 | 0 | 1 | 111.0 | 119 | 54 | 55 | 17 | 26 | 5 | 8 | 3 | 467 | 0 | 5.68 | 2.11 | 2.69 | 1.38 | 15.0 | 5.6 | 1.31 | .292 | 4.46 | 111 | 4.69 | 122 | 9.65 | -10.7 |
| 8 | | A.J. Cole | 1 | 2015 | WSH | 3 | 0 | 0 | 5.79 | 9 | 0 | 0 | 1 | 9.1 | 14 | 6 | 11 | 1 | 1 | 0 | 1 | 1 | 44 | 1 | 8.68 | 0.96 | 9.00 | 0.96 | 20.5 | 2.3 | 1.61 | .394 | 10.61 | 147 | 2.91 | 76 | 13.50 | 1 | |
| 9 | | T. Jordan | 1 | 2015 | WSH | 4 | 0 | 2 | .000 | 5.29 | 11 | 0 | 0 | 0 | 17.0 | 20 | 10 | 10 | 0 | 6 | 0 | 0 | 0 | 77 | 1 | 5.82 | 3.18 | 1.83 | 0.00 | 14.3 | 7.8 | 1.53 | .333 | 5.29 | 134 | 2.89 | 75 | 10.59 | 1.8 |
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