John Schreiber is 6-5 with an ERA of 2.90, 132 strikeouts and 9 saves in 111 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 |  | J. Schreiber | 2021 |  BOS | 1 | 0 | 0 | 0 | 3.00 | 5 | 0 | 0 | 0 | 3.0 | 4 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 13 | 0 | 15.00 | 3.00 | 5.00 | 0.00 | 38.5 | 7.7 | 1.67 | .571 | 3.00 | 66 | 0.83 | 19 | 12.00 | 1.2 | |
| 2 | | J. Schreiber | 2022 | BOS | 64 | 4 | 4 | .500 | 0 | 2.22 | 74 | 0 | 0 | 8 | 65.0 | 45 | 16 | 19 | 3 | 19 | 4 | 13 | 0 | 257 | 4 | 10.25 | 2.63 | 3.89 | 0.42 | 28.8 | 7.4 | 0.98 | .268 | 2.63 | 54 | 2.49 | 63 | 6.23 | 10.7 |
| 3 | | J. Schreiber | 2023 | BOS | 46 | 2 | 1 | .667 | 2 | 3.86 | 53 | 0 | 0 | 1 | 46.2 | 41 | 20 | 22 | 6 | 25 | 4 | 6 | 2 | 204 | 1 | 10.22 | 4.82 | 2.12 | 1.16 | 26.0 | 12.3 | 1.41 | .302 | 4.24 | 85 | 4.52 | 104 | 7.91 | -1 |
| Total | 111 | 6 | 5 | .545 | 2 | 2.90 | 132 | 0 | 0 | 9 | 114.2 | 90 | 37 | 42 | 9 | 45 | 8 | 19 | 2 | 474 | 5 | 10.36 | 3.53 | 2.93 | 0.71 | 27.8 | 9.5 | 1.18 | .289 | 3.30 | 67 | 3.27 | 79 | 7.06 | 10.8 |
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