Mason Thompson played 4 seasons for the Nationals and Padres. He had 7 wins, 9 losses, an ERA of 5.21 and 93 strikeouts.
| 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 |  | M. Thompson | 2021 | TOT | 31 | 1 | 3 | .250 | 0 | 4.01 | 23 | 0 | 0 | 0 | 24.2 | 32 | 11 | 15 | 4 | 15 | 1 | 5 | 1 | 121 | 3 | 8.39 | 5.47 | 1.53 | 1.46 | 19.0 | 12.4 | 1.91 | .359 | 5.47 | 96 | 5.35 | 125 | 11.68 | -2.9 |
| 2 | | M. Thompson | 2022 |  WSH | 24 | 1 | 1 | .500 | 0 | 2.92 | 15 | 0 | 0 | 1 | 24.2 | 19 | 8 | 8 | 2 | 9 | 1 | 8 | 0 | 101 | 1 | 5.47 | 3.28 | 1.67 | 0.73 | 14.9 | 8.9 | 1.14 | .230 | 2.92 | 72 | 4.16 | 103 | 6.93 | -0.4 |
| 3 | | M. Thompson | 2023 | WSH | 51 | 4 | 4 | .500 | 0 | 5.50 | 44 | 0 | 0 | 1 | 54.0 | 62 | 33 | 35 | 4 | 22 | 4 | 5 | 0 | 240 | 4 | 7.33 | 3.67 | 2.00 | 0.67 | 18.3 | 9.2 | 1.56 | .349 | 5.83 | 127 | 4.03 | 91 | 10.33 | 2.3 |
| 4 | | M. Thompson | 2025 | WSH | 14 | 1 | 1 | .500 | 0 | 11.81 | 11 | 0 | 0 | 0 | 10.2 | 16 | 14 | 16 | 1 | 12 | 0 | 3 | 2 | 60 | 0 | 9.28 | 10.13 | 0.92 | 0.84 | 18.3 | 20.0 | 2.63 | .417 | 13.50 | 283 | 5.66 | 136 | 13.50 | -1.7 |
| Total | 120 | 7 | 9 | .438 | 0 | 5.21 | 93 | 0 | 0 | 2 | 114.0 | 129 | 66 | 74 | 11 | 58 | 6 | 21 | 3 | 522 | 8 | 7.34 | 4.58 | 1.60 | 0.87 | 17.8 | 11.1 | 1.64 | .333 | 5.84 | 123 | 4.50 | 105 | 10.18 | -2.7 |
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