Zack Kelly | Boston Red Sox
MLB Player
Zack Kelly
Boston Red SoxHeight6' 3"Weight231 lbsAge31Experience5th Season
0SVTied-261st
3.31ERA
14KTied-577th
1.29WHIP
Player Information
PositionRelief Pitcher
Jersey#76
Date of Birth3/3/1995
BirthplaceRoanoke, VA
Experience5th Season
Bats / ThrowsRight/Right
MLB Debut2022
StatusInjured/60
Next Game
@ Tampa Bay Rays
More Boston Red Sox Players
Season, Postseason & Career
| Split | GP | GS | CG | SHO | IP | H | R | ER | HR | BB | K |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Career | 115 | 3 | 0 | 0 | 131.1 | 114 | 70 | 59 | 16 | 58 | 127 |
Pitching by Season
| Season | GP | GS | W | L | W% | WAR | ERA | WHIP | IP | K | BB | K/BB | H | R | ER | SV | HLD | BLSV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2022 | 13 | 0 | 1 | 0 | 1.000 | 0.2 | 3.95 | 1.32 | 13.2 | 11 | 4 | 2.8 | 14 | 6 | 6 | 0 | 1 | 0 |
| 2023 | 8 | 0 | 0 | 0 | .000 | 0.2 | 3.86 | 1.61 | 9.1 | 6 | 8 | 0.8 | 7 | 4 | 4 | 0 | 0 | 0 |
| 2024 | 49 | 3 | 6 | 3 | .667 | 0.6 | 3.97 | 1.25 | 56.2 | 61 | 27 | 2.3 | 44 | 31 | 25 | 0 | 8 | 1 |
| 2025 | 28 | 0 | 1 | 3 | .250 | -0.2 | 4.58 | 1.33 | 35.1 | 35 | 12 | 2.9 | 35 | 21 | 18 | 0 | 3 | 2 |
| 2026 | 17 | 0 | 0 | 2 | .000 | 0.0 | 3.31 | 1.29 | 16.1 | 14 | 7 | 2.0 | 14 | 8 | 6 | 0 | 3 | 1 |
| Career | 115 | 3 | 8 | 8 | .500 | -- | 4.04 | 1.31 | 131.1 | 127 | 58 | 2.2 | 114 | 70 | 59 | 0 | 15 | 4 |
Postseason Pitching by Season
| Season | GP | GS | W | L | W% | WAR | ERA | WHIP | IP | K | BB | K/BB | H | R | ER | SV | HLD | BLSV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025 | 1 | 0 | 0 | 0 | .000 | 0.0 | 0.00 | 0.00 | 0.1 | 1 | 0 | 0.0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Career | 1 | 0 | 0 | 0 | .000 | 0.0 | 0.00 | 0.00 | 0.1 | 1 | 0 | 0.0 | 0 | 0 | 0 | 0 | 0 | 0 |
Opponent Batting by Season
| Season | P | TBF | P-TBF | OBA | OOBP | OSLUG | OOPS | 2B | 3B | HR | TB | RBI | BH | SH | SF | IBB |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2022 | 222 | 59 | 3.763 | .259 | .305 | .426 | .731 | 3 | 0 | 2 | 23 | 9 | 0 | 0 | 1 | 0 |
| 2023 | 181 | 43 | 4.209 | .219 | .405 | .375 | .780 | 5 | 0 | 0 | 12 | 5 | 2 | 0 | 0 | 0 |
| 2024 | 957 | 241 | 3.971 | .208 | .303 | .387 | .690 | 8 | 0 | 10 | 82 | 32 | 2 | 0 | 0 | 3 |
| 2025 | 582 | 152 | 3.829 | .261 | .333 | .396 | .729 | 9 | 0 | 3 | 53 | 17 | 3 | 2 | 1 | 1 |
| 2026 | 283 | 71 | 3.986 | .233 | .314 | .300 | .614 | 1 | 0 | 1 | 18 | 10 | 1 | 1 | 2 | 0 |
| Career | 2225 | 566 | 3.931 | .232 | .320 | .382 | .702 | 26 | 0 | 16 | 188 | 73 | 8 | 3 | 4 | 4 |
Expanded Pitching by Season
| Season | P/S | P/I | K/9 | QS | CG | SHO | GSC | GB | FB | G/F | IR | IRS | WP | BK | SB | CS | RSUP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2022 | 0.0 | 16.2 | 7.2 | 0 | 0 | 0 | 0.0 | 20 | 24 | 0.8 | 4 | 3 | 0 | 0 | 1 | 1 | 0.0 |
| 2023 | 0.0 | 19.4 | 5.8 | 0 | 0 | 0 | 0.0 | 14 | 12 | 1.2 | 3 | 2 | 1 | 0 | 2 | 0 | 0.0 |
| 2024 | 38.0 | 16.9 | 9.7 | 0 | 0 | 0 | 59.0 | 72 | 79 | 0.9 | 26 | 10 | 2 | 1 | 6 | 1 | 16.0 |
| 2025 | 0.0 | 16.5 | 8.9 | 0 | 0 | 0 | 0.0 | 44 | 58 | 0.8 | 9 | 5 | 1 | 0 | 2 | 0 | 0.0 |
| 2026 | 0.0 | 17.3 | 7.7 | 0 | 0 | 0 | 0.0 | 23 | 26 | 0.9 | 9 | 3 | 1 | 0 | 1 | 0 | 0.0 |
| Career | 38.0 | 16.9 | 8.7 | 0 | 0 | 0 | 0.0 | 173 | 199 | 0.9 | 51 | 23 | 5 | 1 | 12 | 2 | 16.0 |
Game Log
| Game | Result | IP | H | R | ER | HR | BB | K | GB | FB | P | TBF | GSC | Dec | Rel | ERA |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 @ KC2026 Regular SeasonWeek 20 | W 7-1 | 0.2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 8 | 3 | 0.0 | - | - | 3.31 |
 vs PHI2026 Regular SeasonWeek 20 | L 3-1 | 0.2 | 2 | 1 | 0 | 0 | 0 | 1 | 4 | 0 | 26 | 6 | 0.0 | - | - | 3.45 |
| vs PHI2026 Regular SeasonWeek 19 | L 2-1 | 1.0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 11 | 3 | 0.0 | - | - | 3.60 |
| vs TB2026 Regular SeasonWeek 19 | L 4-1 | 0.1 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 2 | 16 | 3 | 0.0 | - | - | 3.86 |
 @ DET2026 Regular SeasonWeek 18 | W 4-0 | 1.0 | 0 | 0 | 0 | 0 | 2 | 2 | 0 | 1 | 25 | 5 | 0.0 | - | - | 3.29 |
 vs HOU2026 Regular SeasonWeek 18 | L 3-1 F/10 | 1.0 | 1 | 2 | 1 | 0 | 2 | 0 | 2 | 1 | 19 | 5 | 0.0 | L(0-2) | - | 3.55 |
| vs HOU2026 Regular SeasonWeek 18 | W 3-1 | 1.1 | 2 | 0 | 0 | 0 | 0 | 2 | 2 | 2 | 19 | 6 | 0.0 | - | HLD(3) | 3.09 |
 @ TOR2026 Regular SeasonWeek 17 | L 3-0 | 1.0 | 1 | 0 | 0 | 0 | 1 | 2 | 1 | 1 | 20 | 5 | 0.0 | - | - | 3.48 |
 @ BAL2026 Regular SeasonWeek 17 | W 5-3 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 | 1 | 0.0 | - | HLD(2) | 3.86 |
 vs NYY2026 Regular SeasonWeek 16 | L 4-1 | 1.0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 1 | 11 | 3 | 0.0 | - | - | 4.00 |
| vs DET2026 Regular SeasonWeek 16 | W 8-6 | 1.2 | 1 | 0 | 0 | 0 | 0 | 1 | 3 | 2 | 27 | 6 | 0.0 | - | BLSV(1) | 4.50 |
| vs DET2026 Regular SeasonWeek 16 | L 4-1 | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 19 | 4 | 0.0 | - | - | 5.68 |
 @ STL2026 Regular SeasonWeek 15 | W 9-3 | 2.0 | 1 | 1 | 1 | 1 | 0 | 2 | 3 | 2 | 23 | 7 | 0.0 | - | - | 6.75 |
| @ STL2026 Regular SeasonWeek 15 | L 3-2 | 0.2 | 2 | 2 | 2 | 0 | 1 | 0 | 1 | 3 | 18 | 5 | 0.0 | L(0-1) | - | 8.10 |
 vs MIL2026 Regular SeasonWeek 14 | W 3-2 | 0.2 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 11 | 2 | 0.0 | - | HLD(1) | 3.38 |
 vs SD2026 Regular SeasonWeek 14 | L 8-6 | 1.0 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 3 | 17 | 4 | 0.0 | - | - | 4.50 |
| vs SD2026 Regular SeasonWeek 14 | L 3-2 | 1.0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 0 | 9 | 3 | 0.0 | - | - | 0.00 |