Luis Castillo has a 31-26 record with an ERA of 3.46 and 510 strikeouts in 83 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 |  | L. Castillo | 2022 |  SEA | 11 | 4 | 2 | .667 | 11 | 3.17 | 77 | 0 | 0 | 0 | 65.1 | 55 | 23 | 26 | 6 | 17 | 4 | 0 | 0 | 266 | 0 | 10.61 | 2.34 | 4.53 | 0.83 | 28.9 | 6.4 | 1.10 | .302 | 3.58 | 85 | 2.91 | 76 | 7.58 | 6.7 |
| 2 | | L. Castillo | 2023 | SEA | 33 | 13 | 9 | .591 | 33 | 3.34 | 219 | 0 | 0 | 0 | 197.0 | 160 | 73 | 81 | 28 | 56 | 5 | 0 | 0 | 802 | 3 | 10.01 | 2.56 | 3.91 | 1.28 | 27.3 | 7.0 | 1.10 | .267 | 3.70 | 83 | 3.80 | 93 | 7.31 | 6.6 |
| 3 | | L. Castillo | 2024 | SEA | 30 | 11 | 12 | .478 | 30 | 3.64 | 175 | 0 | 0 | 0 | 175.1 | 158 | 71 | 73 | 25 | 47 | 5 | 0 | 2 | 719 | 0 | 8.98 | 2.41 | 3.72 | 1.28 | 24.3 | 6.5 | 1.17 | .285 | 3.75 | 97 | 3.91 | 100 | 8.11 | 0 |
| 4 | | L. Castillo | 2025 | SEA | 9 | 3 | 3 | .500 | 9 | 3.65 | 39 | 0 | 0 | 0 | 49.1 | 48 | 20 | 20 | 4 | 20 | 1 | 0 | 0 | 214 | 0 | 7.11 | 3.65 | 1.95 | 0.73 | 18.2 | 9.3 | 1.38 | .293 | 3.65 | 98 | 3.84 | 98 | 8.76 | 0.4 |
| Total | 83 | 31 | 26 | .544 | 83 | 3.46 | 510 | 0 | 0 | 0 | 487.0 | 421 | 187 | 200 | 63 | 140 | 15 | 0 | 2 | 2,001 | 3 | 9.43 | 2.59 | 3.64 | 1.16 | 25.5 | 7.0 | 1.15 | .281 | 3.70 | 90 | 3.72 | 93 | 7.78 | 13.8 |
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