Brayan Bello has a record of 30-28 with an ERA of 4.39 and 360 strikeouts in 77 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 |  | B. Bello | 2022 |  BOS | 13 | 2 | 8 | .200 | 11 | 4.71 | 55 | 1 | 0 | 0 | 57.1 | 75 | 30 | 34 | 1 | 27 | 2 | 0 | 1 | 268 | 2 | 8.63 | 4.24 | 2.04 | 0.16 | 20.5 | 10.1 | 1.78 | .404 | 5.34 | 115 | 2.93 | 74 | 11.77 | 6.6 |
| 2 | | B. Bello | 2023 | BOS | 28 | 12 | 11 | .522 | 28 | 4.24 | 132 | 0 | 0 | 0 | 157.0 | 165 | 74 | 77 | 24 | 45 | 6 | 0 | 0 | 668 | 1 | 7.57 | 2.58 | 2.93 | 1.38 | 19.8 | 6.7 | 1.34 | .306 | 4.41 | 94 | 4.53 | 105 | 9.46 | -3.5 |
| 3 | | B. Bello | 2024 | BOS | 30 | 14 | 8 | .636 | 30 | 4.49 | 153 | 0 | 0 | 0 | 162.1 | 157 | 81 | 84 | 19 | 64 | 11 | 0 | 0 | 702 | 6 | 8.48 | 3.55 | 2.39 | 1.05 | 21.8 | 9.1 | 1.36 | .303 | 4.66 | 106 | 4.18 | 101 | 8.70 | -0.9 |
| 4 | | B. Bello | 2025 | BOS | 6 | 2 | 1 | .667 | 6 | 4.02 | 20 | 0 | 0 | 0 | 31.1 | 34 | 14 | 15 | 4 | 19 | 2 | 0 | 0 | 142 | 0 | 5.74 | 5.46 | 1.05 | 1.15 | 14.1 | 13.4 | 1.69 | .309 | 4.31 | 95 | 5.49 | 133 | 9.77 | -4.7 |
| Total | 77 | 30 | 28 | .517 | 75 | 4.39 | 360 | 1 | 0 | 0 | 408.0 | 431 | 199 | 210 | 48 | 155 | 21 | 0 | 1 | 1,780 | 9 | 7.94 | 3.42 | 2.32 | 1.06 | 20.2 | 8.7 | 1.44 | .320 | 4.63 | 101 | 4.24 | 101 | 9.51 | -2.5 |
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