Marco Gonzales was 61-47 with an ERA of 4.08 and 631 strikeouts in 151 appearances for the Mariners in his career.
| 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. Gonzales | 2017 |  SEA | 10 | 1 | 1 | .500 | 7 | 5.40 | 30 | 0 | 0 | 0 | 36.2 | 53 | 22 | 22 | 5 | 11 | 1 | 1 | 0 | 169 | 2 | 7.36 | 2.70 | 2.73 | 1.23 | 17.8 | 6.5 | 1.75 | .393 | 5.40 | 129 | 4.27 | 99 | 13.01 | 0.1 |
| 2 | | M. Gonzales | 2018 | SEA | 29 | 13 | 9 | .591 | 29 | 4.00 | 145 | 1 | 0 | 0 | 166.2 | 172 | 74 | 76 | 17 | 32 | 6 | 0 | 0 | 686 | 2 | 7.83 | 1.73 | 4.53 | 0.92 | 21.1 | 4.7 | 1.22 | .319 | 4.10 | 98 | 3.43 | 82 | 9.29 | 14.2 |
| 3 | | M. Gonzales | 2019 | SEA | 34 | 16 | 13 | .552 | 34 | 3.99 | 147 | 0 | 0 | 0 | 203.0 | 210 | 90 | 106 | 23 | 56 | 6 | 0 | 1 | 866 | 2 | 6.52 | 2.48 | 2.63 | 1.02 | 17.0 | 6.5 | 1.31 | .295 | 4.70 | 90 | 4.14 | 93 | 9.31 | 7.4 |
| 4 | | M. Gonzales | 2020 | SEA | 11 | 7 | 2 | .778 | 11 | 3.10 | 64 | 1 | 0 | 0 | 69.2 | 59 | 24 | 27 | 8 | 7 | 4 | 0 | 0 | 277 | 0 | 8.27 | 0.90 | 9.14 | 1.03 | 23.1 | 2.5 | 0.95 | .263 | 3.49 | 74 | 3.31 | 77 | 7.62 | 7.9 |
| 5 | | M. Gonzales | 2021 | SEA | 25 | 10 | 6 | .625 | 25 | 3.96 | 108 | 1 | 0 | 0 | 143.1 | 125 | 63 | 64 | 29 | 42 | 5 | 0 | 3 | 585 | 1 | 6.78 | 2.64 | 2.57 | 1.82 | 18.5 | 7.2 | 1.17 | .239 | 4.02 | 95 | 5.27 | 127 | 7.85 | -18.6 |
| 6 | | M. Gonzales | 2022 | SEA | 32 | 10 | 15 | .400 | 32 | 4.13 | 103 | 0 | 0 | 0 | 183.0 | 194 | 84 | 97 | 30 | 50 | 7 | 0 | 1 | 783 | 1 | 5.07 | 2.46 | 2.06 | 1.48 | 13.2 | 6.4 | 1.33 | .277 | 4.77 | 111 | 5.05 | 132 | 9.54 | -25.9 |
| 7 | | M. Gonzales | 2023 | SEA | 10 | 4 | 1 | .800 | 10 | 5.22 | 34 | 0 | 0 | 0 | 50.0 | 55 | 29 | 32 | 5 | 18 | 0 | 0 | 0 | 215 | 0 | 6.12 | 3.24 | 1.89 | 0.90 | 15.8 | 8.4 | 1.46 | .316 | 5.76 | 130 | 4.27 | 104 | 9.90 | -1 |
| Total | 151 | 61 | 47 | .565 | 148 | 4.08 | 631 | 3 | 0 | 0 | 852.1 | 868 | 386 | 424 | 117 | 216 | 29 | 1 | 5 | 3,581 | 8 | 6.66 | 2.28 | 2.92 | 1.24 | 17.6 | 6.0 | 1.27 | .290 | 4.48 | 100 | 4.33 | 104 | 9.17 | -16 |
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