Kenley Jansen has a 7-8 record with an ERA of 3.44, 114 strikeouts and 55 saves in 105 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 |  | K. Jansen | 2023 |  BOS | 51 | 3 | 6 | .333 | 0 | 3.63 | 52 | 0 | 0 | 28 | 44.2 | 40 | 18 | 21 | 5 | 17 | 2 | 42 | 1 | 188 | 1 | 10.48 | 3.43 | 3.06 | 1.01 | 27.7 | 9.0 | 1.28 | .313 | 4.23 | 80 | 3.65 | 85 | 8.06 | 3.3 |
| 2 | | K. Jansen | 2024 | BOS | 54 | 4 | 2 | .667 | 0 | 3.29 | 62 | 0 | 0 | 27 | 54.2 | 38 | 20 | 20 | 4 | 20 | 1 | 38 | 2 | 218 | 2 | 10.21 | 3.29 | 3.10 | 0.66 | 28.4 | 9.2 | 1.06 | .260 | 3.29 | 77 | 2.99 | 73 | 6.26 | 6.8 |
| Total | 105 | 7 | 8 | .467 | 0 | 3.44 | 114 | 0 | 0 | 55 | 99.1 | 78 | 38 | 41 | 9 | 37 | 3 | 80 | 3 | 406 | 3 | 10.33 | 3.35 | 3.08 | 0.82 | 28.1 | 9.1 | 1.16 | .284 | 3.71 | 79 | 3.29 | 78 | 7.07 | 10.1 |
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