Paul Sewald has a record of 18-8 with an ERA of 2.88, 236 strikeouts and 51 saves in 172 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 |  | P. Sewald | 2021 |  SEA | 62 | 10 | 3 | .769 | 0 | 3.06 | 104 | 0 | 0 | 11 | 64.2 | 42 | 22 | 24 | 10 | 24 | 0 | 18 | 5 | 264 | 2 | 14.47 | 3.34 | 4.33 | 1.39 | 39.4 | 9.1 | 1.02 | .254 | 3.34 | 74 | 3.07 | 74 | 5.85 | 7.9 |
| 2 | | P. Sewald | 2022 | SEA | 65 | 5 | 4 | .556 | 0 | 2.67 | 72 | 0 | 0 | 20 | 64.0 | 32 | 19 | 21 | 10 | 17 | 4 | 37 | 4 | 242 | 1 | 10.13 | 2.39 | 4.24 | 1.41 | 29.8 | 7.0 | 0.77 | .158 | 2.95 | 72 | 3.87 | 101 | 4.50 | -0.5 |
| 3 | | P. Sewald | 2023 | SEA | 45 | 3 | 1 | .750 | 0 | 2.93 | 60 | 0 | 0 | 20 | 43.0 | 30 | 14 | 15 | 5 | 14 | 0 | 31 | 1 | 169 | 1 | 12.56 | 2.93 | 4.29 | 1.05 | 35.5 | 8.3 | 1.02 | .278 | 3.14 | 73 | 2.95 | 72 | 6.28 | 5.7 |
| Total | 172 | 18 | 8 | .692 | 0 | 2.88 | 236 | 0 | 0 | 51 | 171.2 | 104 | 55 | 60 | 25 | 55 | 4 | 86 | 10 | 675 | 4 | 12.37 | 2.88 | 4.29 | 1.31 | 35.0 | 8.1 | 0.93 | .223 | 3.15 | 73 | 3.34 | 84 | 5.45 | 13.1 |
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