Garrett Whitlock is 23-12 with an ERA of 3.42, 301 strikeouts and 10 saves in 132 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 | 29 | 5 | 1 | .833 | 0 | 3.60 | 49 | 0 | 0 | 1 | 40.0 | 31 | 16 | 17 | 2 | 19 | 3 | 5 | 1 | 169 | 3 | 11.03 | 4.27 | 2.58 | 0.45 | 29.0 | 11.2 | 1.25 | .302 | 3.83 | 85 | 2.92 | 71 | 6.98 | 5.3 |
| Total | 132 | 23 | 12 | .657 | 23 | 3.42 | 301 | 0 | 0 | 10 | 281.2 | 256 | 107 | 118 | 32 | 71 | 11 | 29 | 3 | 1,157 | 10 | 9.62 | 2.27 | 4.24 | 1.02 | 26.0 | 6.1 | 1.16 | .302 | 3.77 | 78 | 3.37 | 80 | 8.18 | 25.4 |
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