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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 16.1 3.31 1.29 19.7% 9.9%
221st 3
Sv
350th 52.0
IP
99th 4.19
ERA
149th 1.34
WHIP
240th 22.7%
K%
195th 9.8%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
95.9 9.2% 25.8% 43.8% 3.5% 5.10 3.05
86th 94.7
FB MPH
303rd 12.2%
SwStr%
291st 28.5%
CSW%
346th 51.2%
Str-ICR
69th 4.7%
MTK%
48th 4.94
PLV
84th 3.56
PLA

Articles

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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 17 0 16.1 0-2 0 3 3.31 1.29 4.26 3.66 3.89 3.05 19.7% 9.9% 7.7 0.55 .277 14.3% 68.0% 46.9% 47.9% 9.2% 25.8% 0.37 5.10
RP MLB Percentile 9 0 0 0-48 0 36 72 57 37 69 69 76 32 43 57 82 62 60 28 2 69 13 17 11 85
RP MLB AVG 42 2 52.0 3-3 3 7 4.19 1.34 4.16 4.17 4.24 3.56 22.7% 9.8% 8.3 1.08 .291 17.6% 72.5% 36.8% 44.0% 12.2% 28.5% 0.50 4.94
Career 115 3 131.1 8-8 0 15 4.04 1.31 3.83 4.31 4.31 3.09 22.4% 10.2% 7.8 1.10 .278 18.4% 69.8% 33.9% 45.4% 11.4% 28.4% 0.50 5.10

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 17 0 16.1 0-2 0 0 3 283 170 113 71 14 12 1 0 1 14 7 1 1
RP MLB Percentile 9 0 0 0-48 0 0 36 0 0 98 0 99 93 98 50 92 3 94 64 51
RP MLB AVG 42 2 52.0 3-3 0 3 7 884 565 319 227 48 32 9 1 6 52 21 3 2
Career 115 3 131.1 8-8 0 0 15 2,225 1,410 815 566 114 72 26 0 16 127 58 8 5

Zack Kelly Advanced

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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 19.7% 9.9% .233 .300 .614 .280 .277 .292 .271 .326 .324 .352 87.2 93.2 8.0 4.26
RP MLB Percentile 32 43 54 87 81 80 62 72 13 37 7 52 59 6 82 37
RP MLB AVG 22.7% 9.8% .241 .389 .712 .314 .291 .321 .235 .314 .280 .358 87.6 89.3 13.1 4.16
Career 22.4% 10.2% .232 .382 .702 .311 .278 .309 .219 .304 .256 .339 86.6 88.1 11.8 3.83

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 BOS43.2% (94.6)4.1% (94.5)0.5% (86.6)13.1% (85.6)--39.2% (82.0)-- 47.3% 52.7%
2023 BOS46.4% (94.5)--18.8% (85.9)--34.8% (82.3)-- 46.4% 53.6%
2024 BOS30.1% (96.5)-21.8% (91.1)0.1% (83.2)27.1% (82.2)-20.9% (83.6)-- 30.1% 69.9%
2025 BOS20.1% (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 BOS13.8% (96.1)17.0% (95.9)43.8% (90.6)-21.9% (81.6)-3.5% (83.6)-- 30.7% 69.3%
RP MLB Percentile 5 (72) 33 (75) 96 (67) - 58 (35) - 6 (19) - - 7.1% 92.3%
RP MLB AVG 38.7% (94.7) 26.6% (94.1) 19.6% (89.4) 25.9% (86.1) 20.7% (82.3) 15.3% (80.3) 17.7% (86.1) 18.9% (86.6) 42.7% (61.5) 48.7% 51.2%
Career28.0% (95.8)6.5% (96.0)23.2% (91.2)3.0% (85.5)19.7% (82.0)0.3% (82.3)19.3% (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 BOS30.2% (5)33.3% (0)0.0% (0)24.1% (4)--24.1% (9)-- 30.5% 23.9%
2023 BOS31.0% (5)--29.4% (3)--19.0% (9)-- 31.0% 22.7%
2024 BOS26.4% (29)-34.0% (21)0.0% (0)32.0% (45)-29.5% (30)-- 26.4% 31.8%
2025 BOS31.6% (17)23.9% (7)30.8% (20)0.0% (0)27.4% (14)33.3% (1)21.7% (8)-- 28.3% 27.9%
2026 BOS17.9% (4)20.8% (2)30.6% (11)-27.4% (8)-10.0% (1)-- 19.5% 28.6%
RP MLB Percentile 3 (1) 13 (83) 72 (42) - 41 (61) - 5 (87) - - 0.9% 49.0%
RP MLB AVG 27.2% (32) 27.6% (13) 26.9% (15) 29.7% (28) 28.4% (20) 27.3% (15) 22.3% (21) 22.6% (21) 19.3% (9) 27.9% 28.8%
Career28.0% (60)23.4% (9)32.0% (52)25.4% (7)30.1% (67)33.3% (1)25.2% (57)-- 27.2% 29.1%

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 47.9% 31.3% 14.6% 6.3% 39.6% 32.7% 42.9% 24.5% 17.0% 52.1% 31.3% 8.3% 8.3% 46.9%
RP MLB Percentile 69 3 3 16 15 7 96 42 30 2 5 15 24 2
RP MLB AVG 44.0% 21.7% 24.1% 10.2% 34.6% 40.9% 33.7% 25.4% 18.1% 63.0% 24.5% 5.8% 6.8% 36.8%
Career 45.4% 24.1% 23.5% 7.3% 35.9% 39.8% 36.0% 24.2% 18.2% 66.2% 22.4% 4.1% 7.6% 33.9%

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 .233 .280 .277 .292 .271 .326 .324 .352 87.2 93.2 8.0 14.3% 46.9% 32.4%
RP MLB Percentile 54 80 62 72 13 37 7 52 59 6 82 60 2 3
RP MLB AVG .241 .314 .291 .321 .235 .314 .280 .358 87.6 89.3 13.1 17.6% 36.8% 24.4%
Career .232 .311 .278 .309 .219 .304 .256 .339 86.6 88.1 11.8 18.4% 33.9% 22.3%

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 44.9% 60.1% 43.5% 30.8% 21.1% 17.0% 78.9% 93.3% 56.3% 16.6% 9.2% 25.8% 17.3% 55.1% 0.37 43.8%
RP MLB Percentile 53 7 12 44 21 30 21 0 62 54 13 17 53 11 11 1
RP MLB AVG 44.5% 63.8% 47.4% 31.7% 25.6% 18.1% 74.4% 83.9% 58.5% 16.4% 12.2% 28.5% 17.1% 58.3% 0.50 51.2%
Career 45.9% 63.4% 46.3% 29.1% 24.6% 18.2% 75.4% 82.6% 61.4% 17.1% 11.4% 28.4% 16.7% 58.2% 0.50 52.0%

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 44.9% 39.9% 21.6% 38.5% 34.6% 20.5% 44.9% 30.0% 48.4% 6.4%
RP MLB Percentile 53 79 97 48 41 80 72 54 87 42
RP MLB AVG 44.5% 34.6% 27.0% 38.4% 36.2% 22.9% 40.9% 29.9% 43.1% 6.6%
Career 45.9% 37.3% 23.7% 39.0% 28.8% 25.2% 46.1% 28.9% 47.4% 6.7%

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 56.2% 15.5% 28.3% 12.6% 45.1% 33.8% 20.1% 27.5% 17.5%
RP MLB Percentile 13 5 26 21 0 0 37 58 32
RP MLB AVG 58.5% 12.1% 29.9% 14.5% 61.0% 50.1% 21.1% 26.7% 19.3%
Career 57.4% 12.4% 31.0% 13.7% 63.0% 50.1% 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 283 5.10 48.4% 19.4% 32.2% 16.3% 3.5% -0.9 -1 3.05
RP MLB Percentile 0 85 76 79 87 87 78 59 53 76
RP MLB AVG 884 4.94 45.9% 17.3% 36.8% 9.1% 4.7% 0.6 -1 3.56
Career 2,225 5.10 50.0% 17.0% 33.0% 16.9% 3.8% 16.1 +9 3.09
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