George Kirby has played 4 seasons for the Mariners. He has 36 wins, 30 losses, an ERA of 3.54 and 525 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 |  | G. Kirby | 2022 |  SEA | 25 | 8 | 5 | .615 | 25 | 3.39 | 133 | 0 | 0 | 0 | 130.0 | 135 | 49 | 54 | 13 | 22 | 5 | 0 | 0 | 542 | 4 | 9.21 | 1.52 | 6.05 | 0.90 | 24.5 | 4.1 | 1.21 | .331 | 3.74 | 91 | 2.98 | 78 | 9.35 | 12.3 |
| 2 | | G. Kirby | 2023 | SEA | 31 | 12 | 10 | .545 | 31 | 3.35 | 172 | 1 | 0 | 0 | 190.2 | 179 | 71 | 74 | 22 | 19 | 6 | 0 | 1 | 757 | 1 | 8.12 | 0.90 | 9.05 | 1.04 | 22.7 | 2.5 | 1.04 | .292 | 3.49 | 83 | 3.34 | 81 | 8.45 | 16.7 |
| 3 | | G. Kirby | 2024 | SEA | 33 | 14 | 11 | .560 | 33 | 3.53 | 179 | 0 | 0 | 0 | 191.0 | 181 | 75 | 82 | 22 | 23 | 7 | 0 | 0 | 778 | 5 | 8.43 | 1.08 | 7.78 | 1.04 | 23.0 | 3.0 | 1.07 | .291 | 3.86 | 94 | 3.25 | 83 | 8.53 | 14.5 |
| 4 | | G. Kirby | 2025 | SEA | 8 | 2 | 4 | .333 | 8 | 4.85 | 41 | 0 | 0 | 0 | 42.2 | 41 | 23 | 23 | 7 | 9 | 2 | 0 | 0 | 175 | 1 | 8.65 | 1.90 | 4.56 | 1.48 | 23.4 | 5.1 | 1.17 | .293 | 4.85 | 128 | 4.06 | 103 | 8.65 | -0.7 |
| Total | 97 | 36 | 30 | .545 | 97 | 3.54 | 525 | 1 | 0 | 0 | 554.1 | 536 | 218 | 233 | 64 | 73 | 20 | 0 | 1 | 2,252 | 11 | 8.52 | 1.19 | 7.19 | 1.04 | 23.3 | 3.2 | 1.10 | .301 | 3.78 | 92 | 3.28 | 83 | 8.70 | 42.7 |
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