Gregory Santos had a 1-2 record with an ERA of 5.02 and 6 strikeouts in 16 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 |  | G. Santos | 2024 |  SEA | 8 | 0 | 1 | .000 | 0 | 4.91 | 6 | 0 | 0 | 0 | 7.1 | 7 | 4 | 4 | 0 | 1 | 1 | 1 | 0 | 31 | 0 | 7.36 | 1.23 | 6.00 | 0.00 | 19.4 | 3.2 | 1.09 | .304 | 4.91 | 130 | 2.34 | 60 | 8.59 | 1.3 |
| 2 | | G. Santos | 2025 | SEA | 8 | 1 | 1 | .500 | 0 | 5.14 | 0 | 0 | 0 | 0 | 7.0 | 8 | 4 | 6 | 0 | 8 | 0 | 2 | 2 | 36 | 2 | 0.00 | 10.29 | 0.00 | 0.00 | 0.0 | 22.2 | 2.29 | .286 | 7.71 | 134 | 6.56 | 164 | 10.29 | -2.1 |
| Total | 16 | 1 | 2 | .333 | 0 | 5.02 | 6 | 0 | 0 | 0 | 14.1 | 15 | 8 | 10 | 0 | 9 | 1 | 3 | 2 | 67 | 2 | 3.77 | 5.65 | 0.67 | 0.00 | 9.0 | 13.4 | 1.67 | .294 | 6.28 | 132 | 4.40 | 110 | 9.42 | -0.7 |
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