Matt Barnes had a 32-30 record with an ERA of 4.07, 556 strikeouts and 47 saves in 429 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 |  | M. Barnes | 2014 |  BOS | 5 | 0 | 0 | 0 | 4.00 | 8 | 0 | 0 | 0 | 9.0 | 11 | 4 | 4 | 1 | 2 | 0 | 3 | 0 | 39 | 0 | 8.00 | 2.00 | 4.00 | 1.00 | 20.5 | 5.1 | 1.44 | .357 | 4.00 | 100 | 3.46 | 92 | 11.00 | 0.3 | |
| 2 | | M. Barnes | 2015 | BOS | 32 | 3 | 4 | .429 | 2 | 5.44 | 39 | 0 | 0 | 0 | 43.0 | 56 | 26 | 28 | 9 | 15 | 2 | 7 | 0 | 199 | 4 | 8.16 | 3.14 | 2.60 | 1.88 | 19.6 | 7.5 | 1.65 | .351 | 5.86 | 131 | 5.22 | 132 | 11.72 | -6.2 |
| 3 | | M. Barnes | 2016 | BOS | 62 | 4 | 3 | .571 | 0 | 4.05 | 71 | 0 | 0 | 1 | 66.2 | 62 | 30 | 32 | 6 | 31 | 3 | 13 | 1 | 287 | 4 | 9.58 | 4.18 | 2.29 | 0.81 | 24.7 | 10.8 | 1.39 | .318 | 4.32 | 92 | 3.71 | 88 | 8.37 | 3.6 |
| 4 | | M. Barnes | 2017 | BOS | 70 | 7 | 3 | .700 | 0 | 3.88 | 83 | 0 | 0 | 1 | 69.2 | 57 | 30 | 31 | 7 | 28 | 1 | 15 | 0 | 287 | 3 | 10.72 | 3.62 | 2.96 | 0.90 | 28.9 | 9.8 | 1.22 | .298 | 4.00 | 85 | 3.32 | 77 | 7.36 | 7.9 |
| 5 | | M. Barnes | 2018 | BOS | 62 | 6 | 4 | .600 | 0 | 3.65 | 96 | 0 | 0 | 0 | 61.2 | 47 | 25 | 25 | 5 | 31 | 2 | 8 | 1 | 265 | 8 | 14.01 | 4.52 | 3.10 | 0.73 | 36.2 | 11.7 | 1.26 | .321 | 3.65 | 82 | 2.70 | 65 | 6.86 | 10.3 |
| 6 | | M. Barnes | 2019 | BOS | 70 | 5 | 4 | .556 | 0 | 3.78 | 110 | 0 | 0 | 4 | 64.1 | 51 | 27 | 29 | 8 | 38 | 2 | 14 | 2 | 285 | 13 | 15.39 | 5.32 | 2.89 | 1.12 | 38.6 | 13.3 | 1.38 | .339 | 4.06 | 78 | 3.26 | 72 | 7.13 | 9 |
| 7 | | M. Barnes | 2020 | BOS | 24 | 1 | 3 | .250 | 0 | 4.30 | 31 | 0 | 0 | 9 | 23.0 | 18 | 11 | 13 | 4 | 14 | 2 | 14 | 1 | 102 | 4 | 12.13 | 5.48 | 2.21 | 1.57 | 30.4 | 13.7 | 1.39 | .275 | 5.09 | 92 | 4.83 | 109 | 7.04 | -1 |
| 8 | | M. Barnes | 2021 | BOS | 60 | 6 | 5 | .545 | 0 | 3.79 | 84 | 0 | 0 | 24 | 54.2 | 41 | 23 | 25 | 8 | 20 | 2 | 44 | 2 | 222 | 3 | 13.83 | 3.29 | 4.20 | 1.32 | 37.8 | 9.0 | 1.12 | .306 | 4.12 | 83 | 3.20 | 74 | 6.75 | 6.8 |
| 9 | | M. Barnes | 2022 | BOS | 44 | 0 | 4 | .000 | 0 | 4.31 | 34 | 0 | 0 | 8 | 39.2 | 36 | 19 | 22 | 2 | 21 | 3 | 16 | 1 | 176 | 4 | 7.71 | 4.76 | 1.62 | 0.45 | 19.3 | 11.9 | 1.44 | .293 | 4.99 | 105 | 3.86 | 97 | 8.17 | 0.5 |
| Total | 429 | 32 | 30 | .516 | 2 | 4.07 | 556 | 0 | 0 | 47 | 431.2 | 379 | 195 | 209 | 50 | 200 | 17 | 134 | 8 | 1,862 | 43 | 11.59 | 4.17 | 2.78 | 1.04 | 29.9 | 10.7 | 1.34 | .317 | 4.36 | 91 | 3.59 | 85 | 7.90 | 31.2 |
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