Garrett Whitlock has a 21-11 record with an ERA of 3.44, 286 strikeouts and 9 saves in 122 appearances for the Red Sox 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. Whitlock | 2021 |  BOS | 46 | 8 | 4 | .667 | 0 | 1.96 | 81 | 0 | 0 | 2 | 73.1 | 64 | 16 | 22 | 6 | 17 | 3 | 11 | 2 | 298 | 3 | 9.94 | 2.09 | 4.76 | 0.74 | 27.2 | 5.7 | 1.10 | .304 | 2.70 | 43 | 2.83 | 66 | 7.85 | 12 |
| 2 | | G. Whitlock | 2022 | BOS | 31 | 4 | 2 | .667 | 9 | 3.45 | 82 | 0 | 0 | 6 | 78.1 | 65 | 30 | 32 | 10 | 15 | 1 | 10 | 0 | 311 | 2 | 9.42 | 1.72 | 5.47 | 1.15 | 26.4 | 4.8 | 1.02 | .271 | 3.68 | 84 | 3.28 | 83 | 7.47 | 6 |
| 3 | | G. Whitlock | 2023 | BOS | 22 | 5 | 5 | .500 | 10 | 5.15 | 72 | 0 | 0 | 1 | 71.2 | 82 | 41 | 43 | 13 | 13 | 3 | 3 | 0 | 304 | 2 | 9.04 | 1.63 | 5.54 | 1.63 | 23.7 | 4.3 | 1.33 | .340 | 5.40 | 114 | 4.27 | 99 | 10.30 | 0.5 |
| 4 | | G. Whitlock | 2024 | BOS | 4 | 1 | 0 | 1.000 | 4 | 1.96 | 17 | 0 | 0 | 0 | 18.1 | 14 | 4 | 4 | 1 | 7 | 1 | 0 | 0 | 75 | 0 | 8.35 | 3.44 | 2.43 | 0.49 | 22.7 | 9.3 | 1.15 | .265 | 1.96 | 46 | 3.32 | 81 | 6.87 | 1.6 |
| 5 | | G. Whitlock | 2025 | BOS | 19 | 3 | 0 | 1.000 | 0 | 3.90 | 34 | 0 | 0 | 0 | 27.2 | 25 | 12 | 13 | 2 | 12 | 2 | 3 | 0 | 120 | 3 | 11.06 | 3.90 | 2.83 | 0.65 | 28.3 | 10.0 | 1.34 | .329 | 4.23 | 94 | 3.07 | 75 | 8.13 | 3.1 |
| Total | 122 | 21 | 11 | .656 | 23 | 3.44 | 286 | 0 | 0 | 9 | 269.1 | 250 | 103 | 114 | 32 | 64 | 10 | 27 | 2 | 1,108 | 10 | 9.56 | 2.14 | 4.47 | 1.07 | 25.8 | 5.8 | 1.17 | .304 | 3.81 | 79 | 3.40 | 81 | 8.35 | 23.2 |
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