Chris Flexen has a 22-19 record with an ERA of 4.13, 249 strikeouts and 2 saves in 81 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 |  | C. Flexen | 2021 |  SEA | 31 | 14 | 6 | .700 | 31 | 3.61 | 125 | 0 | 0 | 0 | 179.2 | 185 | 72 | 74 | 19 | 40 | 4 | 0 | 0 | 741 | 2 | 6.26 | 2.00 | 3.13 | 0.95 | 16.9 | 5.4 | 1.25 | .300 | 3.71 | 87 | 3.88 | 94 | 9.27 | 5.3 |
| 2 | | C. Flexen | 2022 | SEA | 33 | 8 | 9 | .471 | 22 | 3.73 | 95 | 0 | 0 | 2 | 137.2 | 132 | 57 | 61 | 17 | 51 | 2 | 11 | 3 | 590 | 7 | 6.21 | 3.33 | 1.86 | 1.11 | 16.1 | 8.6 | 1.33 | .271 | 3.99 | 100 | 4.49 | 117 | 8.63 | -10.7 |
| 3 | | C. Flexen | 2023 | SEA | 17 | 0 | 4 | .000 | 4 | 7.71 | 29 | 0 | 0 | 0 | 42.0 | 59 | 36 | 36 | 11 | 19 | 0 | 9 | 0 | 196 | 2 | 6.21 | 4.07 | 1.53 | 2.36 | 14.8 | 9.7 | 1.86 | .350 | 7.71 | 192 | 6.63 | 161 | 12.64 | -12.3 |
| Total | 81 | 22 | 19 | .537 | 57 | 4.13 | 249 | 0 | 0 | 2 | 359.1 | 376 | 165 | 171 | 47 | 110 | 6 | 20 | 3 | 1,527 | 11 | 6.24 | 2.76 | 2.26 | 1.18 | 16.3 | 7.2 | 1.35 | .295 | 4.28 | 104 | 4.43 | 111 | 9.42 | -17.8 |
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