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Zack Kelly

#76 - Relief Pitcher

Boston Red Sox

Bats / Throws Right / Right
Date of Birth 3/3/1995 (31)
Height, Weight 6'3", 231 lb
Hometown Roanoke, VA

2026 Season Stats

Needs more playing time to qualify
MLB Rank MLB Average
Sv IP ERA WHIP K% BB%
0 15.2 3.45 1.28 20.6% 10.3%
- 1
Sv
- 15.0
IP
- 4.74
ERA
- 1.46
WHIP
- 22.0%
K%
- 10.7%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
96.0 9.5% 26.2% 44.7% 4.7% 4.94 3.99
- 94.2
FB MPH
- 11.9%
SwStr%
- 28.4%
CSW%
- 50.2%
Str-ICR
- 6.0%
MTK%
- 4.72
PLV
- 4.73
PLA

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Zack Kelly Overview

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Year Team G GS IP W-L Sv Hld ERA WHIP xERA FIP xFIP PLA K% BB% H/9 HR/9 BABIP HR/FB% LOB% ICR GB% SwStr% CSW% IPR PLV
2022 BOS 13 0 13.2 1-0 0 1 3.95 1.32 2.51 4.32 5.13 3.23 18.6% 6.8% 9.2 1.32 .286 12.5% 78.9% 25.0% 41.9% 8.1% 27.0% 0.44 5.02
2023 BOS 8 0 9.1 0-0 0 0 3.86 1.61 5.80 5.23 6.91 5.31 14.0% 18.6% 6.8 0.00 .269 0.0% 76.5% 30.8% 57.7% 9.4% 26.5% 0.40 4.66
2024 BOS 49 3 56.2 6-3 0 8 3.97 1.25 3.93 4.86 3.94 2.88 25.3% 11.2% 7.0 1.59 .241 30.3% 71.2% 35.1% 47.0% 13.1% 30.2% 0.56 5.17
2025 BOS 28 0 35.1 1-3 0 3 4.58 1.33 3.46 3.53 4.16 2.80 23.0% 7.9% 8.9 0.76 .330 12.0% 63.3% 30.4% 40.2% 11.5% 28.0% 0.52 5.15
2026 BOS 16 0 15.2 0-2 0 3 3.45 1.28 3.79 3.70 3.73 3.99 20.6% 10.3% 7.5 0.57 .273 16.7% 66.3% 45.7% 51.1% 9.5% 26.2% 0.39 4.94
RP MLB Percentile - - - --- - - - - - - - - - - - - - - - - - - - - -
RP MLB AVG 12 1 15.0 1-1 1 2 4.74 1.46 4.43 4.43 4.40 4.73 22.0% 10.7% 8.8 1.11 .296 17.5% 71.6% 37.5% 44.3% 11.9% 28.4% 0.49 4.72
Career 114 3 130.2 8-8 0 15 4.06 1.31 3.77 4.31 4.29 3.20 22.6% 10.3% 7.8 1.10 .277 18.6% 69.6% 33.6% 45.8% 11.4% 28.5% 0.51 5.08

Zack Kelly Repertoire

2022 2023 2024 2025 2026 All
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Zack Kelly Game Log

Zack Kelly Standard

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Year Team G GS IP W-L QS Sv Hld P Strikes Balls TBF H 1B 2B 3B HR K BB HB WP
2022 BOS 13 0 13.2 1-0 0 0 1 222 144 78 59 14 9 3 0 2 11 4 0 0
2023 BOS 8 0 9.1 0-0 0 0 0 181 104 76 43 7 2 5 0 0 6 8 2 1
2024 BOS 49 3 56.2 6-3 0 0 8 957 609 348 241 44 26 8 0 10 61 27 2 2
2025 BOS 28 0 35.1 1-3 0 0 3 582 383 200 152 35 23 9 0 3 35 12 3 1
2026 BOS 16 0 15.2 0-2 0 0 3 275 165 110 68 13 11 1 0 1 14 7 1 1
RP MLB Percentile - - - --- - - - - - - - - - - - - - - - -
RP MLB AVG 12 1 15.0 1-1 0 1 2 266 168 98 68 14 10 3 0 2 15 7 1 1
Career 114 3 130.2 8-8 0 0 15 2,217 1,405 812 563 113 71 26 0 16 127 58 8 5

Zack Kelly Advanced

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team K% BB% AVG SLG OPS wOBA BABIP BACON xAVG xwOBA xBABIP xwoBACON EV FB EV LA xERA
2022 BOS 18.6% 6.8% .259 .426 .731 .316 .286 .318 .180 .252 .177 .276 85.0 86.0 14.8 2.51
2023 BOS 14.0% 18.6% .219 .375 .780 .357 .269 .269 .234 .367 .252 .322 92.9 86.7 8.9 5.80
2024 BOS 25.3% 11.2% .208 .387 .690 .300 .241 .291 .206 .302 .237 .357 86.8 90.5 11.8 3.93
2025 BOS 23.0% 7.9% .261 .396 .729 .318 .330 .350 .228 .289 .285 .326 85.0 85.2 13.0 3.46
2026 BOS 20.6% 10.3% .228 .298 .611 .283 .273 .289 .256 .315 .309 .336 86.8 95.3 6.8 3.79
RP MLB Percentile - - - - - - - - - - - - - - - -
RP MLB AVG 22.0% 10.7% .245 .394 .728 .325 .296 .325 .238 .326 .283 .368 88.1 89.3 13.1 4.43
Career 22.6% 10.3% .231 .382 .702 .315 .277 .309 .217 .305 .254 .340 86.5 88.2 11.6 3.77

Zack Kelly Pitch › Mix

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Year Team FF% (MPH) SI% (MPH) FC% (MPH) SL% (MPH) ST% (MPH) CB% (MPH) CH% (MPH) FS% (MPH) KN% (MPH) Fastball% Secondary%
2022 BOS 43.2% (94.6) 4.1% (94.5) 0.5% (86.6) 13.1% (85.6) - - 39.2% (82.0) - - 47.3% 52.7%
2023 BOS 46.4% (94.5) - - 18.8% (85.9) - - 34.8% (82.3) - - 46.4% 53.6%
2024 BOS 30.1% (96.5) - 21.8% (91.1) 0.1% (83.2) 27.1% (82.2) - 20.9% (83.6) - - 30.1% 69.9%
2025 BOS 20.1% (96.1) 15.1% (96.2) 31.3% (91.8) 0.5% (81.3) 20.1% (81.8) 1.0% (82.3) 11.9% (83.1) - - 35.2% 64.8%
2026 BOS 13.8% (96.1) 17.1% (96.0) 44.0% (90.6) - 21.5% (81.6) - 3.6% (83.6) - - 30.9% 69.1%
RP MLB Percentile - - - - - - - - - - -
RP MLB AVG 35.9% (94.2) 26.7% (93.9) 20.7% (89.3) 26.7% (85.5) 23.3% (82.5) 17.2% (80.7) 18.4% (86.0) 19.5% (86.2) 31.7% (68.1) 47.5% 52.3%
Career 28.1% (95.8) 6.5% (96.0) 23.1% (91.2) 3.0% (85.5) 19.6% (85.5) 0.3% (82.3) 19.4% (83.0) - - 34.6% 65.4%

Zack Kelly Pitch › Results

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Year Team FF CSW% SI CSW% FC CSW% SL CSW% ST CSW% CB CSW% CH CSW% FS CSW% KN CSW% Fastball CSW% Secondary CSW%
2022 BOS 30.2% (5) 33.3% (0) 0.0% (0) 24.1% (4) - - 24.1% (9) - - 30.5% 23.9%
2023 BOS 31.0% (5) - - 29.4% (3) - - 19.0% (9) - - 31.0% 22.7%
2024 BOS 26.4% (29) - 34.0% (21) 0.0% (0) 32.0% (45) - 29.5% (30) - - 26.4% 31.8%
2025 BOS 31.6% (17) 23.9% (7) 30.8% (20) 0.0% (0) 27.4% (14) 33.3% (1) 21.7% (8) - - 28.3% 27.9%
2026 BOS 18.4% (4) 21.3% (2) 30.6% (11) - 28.8% (8) - 10.0% (1) - - 20.0% 28.9%
RP MLB Percentile - - - - - - - - - - -
RP MLB AVG 26.8% (9) 28.0% (5) 27.5% (6) 29.7% (9) 27.6% (8) 26.8% (5) 21.9% (7) 25.9% (9) 23.4% (6) 27.8% 28.3%
Career 28.1% (60) 23.6% (9) 32.0% (52) 25.4% (7) 30.3% (67) 33.3% (1) 25.2% (57) - - 27.2% 29.2%

Zack Kelly Batted Ball › Contact

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Year Team GB% LD% FB% PU% SS% Pull% Cent% Oppo% Foul Str% PC% Fl&B% Solid% Brl% ICR
2022 BOS 41.9% 16.3% 37.2% 4.7% 30.2% 50.0% 27.3% 22.7% 18.0% 74.5% 18.6% 0.0% 7.0% 25.0%
2023 BOS 57.7% 19.2% 23.1% 3.8% 30.8% 42.3% 38.5% 19.2% 16.6% 73.1% 23.1% 0.0% 7.7% 30.8%
2024 BOS 47.0% 23.2% 21.9% 7.9% 36.4% 38.4% 38.4% 23.2% 17.7% 65.0% 21.2% 4.6% 9.3% 35.1%
2025 BOS 40.2% 26.5% 24.5% 8.8% 37.3% 40.2% 32.4% 27.5% 20.3% 69.6% 21.6% 3.9% 4.9% 30.4%
2026 BOS 51.1% 28.9% 13.3% 6.7% 37.8% 32.6% 41.3% 26.1% 17.1% 53.3% 31.1% 6.7% 8.9% 45.7%
RP MLB Percentile - - - - - - - - - - - - - -
RP MLB AVG 44.3% 21.3% 24.4% 10.1% 34.1% 41.7% 33.5% 24.8% 17.5% 62.3% 24.2% 6.0% 7.5% 37.5%
Career 45.8% 23.7% 23.4% 7.4% 35.7% 39.8% 35.8% 24.4% 18.2% 66.5% 22.3% 3.8% 7.6% 33.6%

Zack Kelly Batted Ball › Outcomes

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Year Team AVG wOBA BABIP BACON xAVG xwOBA xBABIP xwoBACON EV FB EV LA HR/FB ICR IPA%
2022 BOS .259 .316 .286 .318 .180 .252 .177 .276 85.0 86.0 14.8 12.5% 25.0% 18.6%
2023 BOS .219 .357 .269 .269 .234 .367 .252 .322 92.9 86.7 8.9 0.0% 30.8% 18.6%
2024 BOS .208 .300 .241 .291 .206 .302 .237 .357 86.8 90.5 11.8 30.3% 35.1% 22.0%
2025 BOS .261 .318 .330 .350 .228 .289 .285 .326 85.0 85.2 13.0 12.0% 30.4% 20.4%
2026 BOS .228 .283 .273 .289 .256 .315 .309 .336 86.8 95.3 6.8 16.7% 45.7% 30.9%
RP MLB Percentile - - - - - - - - - - - - - -
RP MLB AVG .245 .325 .296 .325 .238 .326 .283 .368 88.1 89.3 13.1 17.5% 37.5% 24.6%
Career .231 .315 .277 .309 .217 .305 .254 .340 86.5 88.2 11.6 18.6% 33.6% 22.0%

Zack Kelly Approach › Plate Discipline

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Year Team Zone% Str% Swing% O-Sw% Whiff% Foul Str% Con% Z-Con% O-Con% CS% SwStr% CSW% BIP% PLUS% IPR Str-ICR
2022 BOS 49.1% 64.9% 45.9% 22.1% 17.6% 18.0% 82.4% 89.6% 60.0% 18.9% 8.1% 27.0% 19.8% 58.6% 0.44 55.0%
2023 BOS 37.6% 57.5% 40.3% 29.2% 23.3% 16.6% 76.7% 80.0% 72.7% 17.1% 9.4% 26.5% 14.4% 53.6% 0.40 48.6%
2024 BOS 46.1% 63.6% 46.5% 28.1% 28.1% 17.7% 71.9% 79.3% 56.6% 17.1% 13.1% 30.2% 15.8% 59.0% 0.56 52.6%
2025 BOS 47.6% 65.8% 49.3% 32.5% 23.3% 20.3% 76.7% 81.4% 67.7% 16.5% 11.5% 28.0% 17.5% 59.8% 0.52 55.2%
2026 BOS 44.4% 60.0% 43.3% 31.4% 21.8% 17.1% 78.2% 93.0% 56.3% 16.7% 9.5% 26.2% 16.7% 55.3% 0.39 44.7%
RP MLB Percentile - - - - - - - - - - - - - - - -
RP MLB AVG 44.2% 62.9% 46.4% 30.7% 25.5% 17.5% 74.5% 83.8% 59.0% 16.6% 11.9% 28.4% 17.0% 57.5% 0.49 50.2%
Career 45.9% 63.4% 46.3% 29.2% 24.7% 18.2% 75.3% 82.5% 61.4% 17.1% 11.4% 28.5% 16.6% 58.3% 0.51 52.2%

Zack Kelly Approach › Locations

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Year Team Zone% aLoc% x-mLoc% gLoc% hiLoc% y-mLoc% loLoc% iLoc% oLoc% mmLoc%
2022 BOS 49.1% 36.9% 26.1% 36.9% 23.9% 26.1% 50.0% 31.5% 42.3% 9.5%
2023 BOS 37.6% 53.6% 23.8% 22.7% 32.0% 24.9% 43.1% 22.7% 53.6% 6.1%
2024 BOS 46.1% 31.8% 24.0% 44.2% 27.8% 26.5% 45.7% 25.2% 50.8% 6.5%
2025 BOS 47.6% 40.4% 23.2% 36.4% 28.4% 24.9% 46.7% 35.4% 41.4% 6.2%
2026 BOS 44.4% 40.4% 21.8% 37.8% 35.6% 20.0% 44.4% 30.2% 48.0% 6.2%
RP MLB Percentile - - - - - - - - - -
RP MLB AVG 44.2% 35.1% 26.7% 38.2% 36.2% 22.8% 41.0% 30.5% 42.8% 6.5%
Career 45.9% 37.4% 23.7% 38.9% 28.9% 25.1% 46.0% 28.9% 47.4% 6.6%

Zack Kelly Approach › Counts

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Year Team Early% Behind% 2-Str% Early BIP% F-Str% TF-Str% ECS% 2-Str O-Sw% PAR%
2022 BOS 59.9% 14.4% 25.7% 16.5% 63.3% 51.7% 24.8% 28.1% 19.3%
2023 BOS 54.1% 17.1% 28.7% 14.3% 46.5% 39.5% 22.4% 25.0% 11.5%
2024 BOS 57.6% 11.8% 32.0% 12.5% 66.9% 53.3% 23.8% 22.9% 19.9%
2025 BOS 57.9% 9.5% 33.5% 14.8% 69.5% 55.0% 22.8% 27.7% 17.9%
2026 BOS 55.3% 15.6% 29.1% 11.8% 45.6% 35.3% 20.4% 27.5% 17.5%
RP MLB Percentile - - - - - - - - -
RP MLB AVG 58.5% 12.8% 29.2% 14.2% 59.8% 49.4% 21.0% 25.9% 19.3%
Career 57.3% 12.4% 31.1% 13.6% 63.1% 50.4% 23.1% 25.4% 18.4%

Zack Kelly PLV

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team P PLV QP% AP% BP% Q-BP% MTK% HP HL PLA
2022 BOS 222 5.02 48.6% 16.2% 35.1% 13.5% 3.2% 1.2 +4 3.23
2023 BOS 181 4.66 41.7% 16.1% 42.2% -0.6% 5.6% 2.1 +1 5.31
2024 BOS 957 5.17 52.2% 15.5% 32.3% 20.0% 3.6% 8.1 +1 2.88
2025 BOS 582 5.15 50.1% 18.9% 31.0% 19.0% 3.9% 5.5 +4 2.80
2026 BOS 275 4.94 45.8% 17.1% 37.1% 8.7% 4.7% 1.8 +1 3.99
RP MLB Percentile - - - - - - - - - -
RP MLB AVG 266 4.72 39.7% 19.8% 40.5% -0.8% 6.0% 1.9 +2 4.73
Career 2,217 5.08 49.7% 16.7% 33.6% 16.0% 3.9% 18.8 +11 3.20
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