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Zack Kelly
Zack Kelly
Boston Red Sox • Pitcher
Age 31 • 6' 3" • 231 lb
Bats: R • Throws: R
MLB Debut: 2022-08-29
Born: Roanoke , VA • USA
2026 Stats
W
0
L
2
ERA
3.31
WHIP
1.29
IP
16.1
SO
14
SV
0
HLD
3
G
17
GS
0
Career Stats
W
8
L
8
ERA
4.04
WHIP
1.31
IP
131.1
SO
127
SV
0
HLD
15
G
115
GS
3
Year-by-Year Pitching
Year Team GGSIP WLSVSO ERAWHIPAwards
2022 BOS 13 — 13.2 1 — — 11 3.95 1.32
2023 BOS 8 — 9.1 — — — 6 3.86 1.61
2024 BOS 49 3 56.2 6 3 — 61 3.97 1.25
2025 BOS 28 — 35.1 1 3 — 35 4.58 1.33
2026 BOS 17 — 16.1 — 2 — 14 3.31 1.29
Spring Training
Pitching
YearTeamGGSIPWLSVSOERAWHIP
2019 LAA 2—2.0 1—12 0.001.50
2022 BOS 3—3.0 1——1 0.001.67
2023 BOS 8—10.0 1——7 2.701.40
2024 BOS 3—3.0 ——13 6.002.67
2025 BOS 7—7.2 ———8 2.350.65
2026 BOS 7—6.2 1—24 5.401.80
Postseason
Pitching
YearTeamGGSIPWLSVSOERAWHIP
2025 BOS 1—0.1 ———1 0.000.00
Game Logs
Season selector loads one year at a time.
Pitching
Date Opponent IP H R ER BB SO HR
2026-05-19 @ KC 0.2 1 0 0 0 0 0
2026-05-14 vs PHI 0.2 2 1 0 0 1 0
2026-05-12 vs PHI 1.0 0 0 0 0 1 0
2026-05-10 vs TB 0.1 1 1 1 1 0 0
2026-05-06 @ DET 1.0 0 0 0 2 2 0
2026-05-03 vs HOU 1.0 1 2 1 2 0 0
2026-05-01 vs HOU 1.1 2 0 0 0 2 0
2026-04-28 @ TOR 1.0 1 0 0 1 2 0
2026-04-26 @ BAL 0.1 0 0 0 0 0 0
2026-04-22 vs NYY 1.0 0 0 0 0 2 0
2026-04-20 vs DET 1.2 1 0 0 0 1 0
2026-04-18 vs DET 1.0 1 0 0 0 0 0
2026-04-12 @ STL 2.0 1 1 1 0 2 1
2026-04-10 @ STL 0.2 2 2 2 1 0 0
2026-04-07 vs MIL 0.2 0 0 0 0 0 0
2026-04-05 vs SD 1.0 1 1 1 0 0 0
2026-04-04 vs SD 1.0 0 0 0 0 1 0
Transactions
Entire history • newest first.
2026-07-21
Boston Red Sox placed RHP Zack Kelly on the 60-day injured list. Right elbow inflammation.
2026-07-21
Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
2026-05-22
Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
2026-04-16
RHP Zack Kelly changed number to 76.
2026-04-15
RHP Zack Kelly changed number to 42.
2026-04-03
Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
2026-03-23
Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
2025-09-01
Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
2025-08-02
Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
2025-07-24
Boston Red Sox sent RHP Zack Kelly on a rehab assignment to Greenville Drive.
2025-07-24
Boston Red Sox sent RHP Zack Kelly on a rehab assignment to Greenville Drive.
2025-06-03
Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
2025-05-27
Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
2025-05-25
Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
2025-04-22
Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
2025-04-16
RHP Zack Kelly changed number to 76.
2025-04-15
RHP Zack Kelly changed number to 42.
2024-10-01
Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
2024-09-14
Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
2024-06-05
Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
2024-05-26
Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
2024-04-24
Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
2024-03-22
Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
2023-09-24
Boston Red Sox activated RHP Zack Kelly from the 60-day injured list.
2023-09-16
Boston Red Sox sent RHP Zack Kelly on a rehab assignment to Worcester Red Sox.
2023-09-13
Boston Red Sox sent RHP Zack Kelly on a rehab assignment to Portland Sea Dogs.
2023-09-05
Boston Red Sox sent RHP Zack Kelly on a rehab assignment to Salem Red Sox.
2023-09-01
Boston Red Sox sent RHP Zack Kelly on a rehab assignment to Greenville Drive.
2023-04-16
Boston Red Sox transferred RHP Zack Kelly from the 15-day injured list to the 60-day injured list. Right elbow inflammation.
2023-04-13
Boston Red Sox placed RHP Zack Kelly on the 15-day injured list. Right elbow inflammation.
2022-09-05
Boston Red Sox activated RHP Zack Kelly from the paternity list.
2022-09-02
Boston Red Sox placed RHP Zack Kelly on the paternity list.
2022-08-29
Boston Red Sox selected the contract of RHP Zack Kelly from Worcester Red Sox.
2021-12-21
RHP Zack Kelly roster status changed by Boston Red Sox.
2021-12-21
Boston Red Sox invited non-roster RHP Zack Kelly to spring training.
2021-01-04
Boston Red Sox signed free agent RHP Zack Kelly to a minor league contract.
2019-02-25
RHP Zack Kelly assigned to Los Angeles Angels.
2018-04-27
Los Angeles Angels signed free agent RHP Zack Kelly to a minor league contract.
2017-06-16
Oakland Athletics signed free agent RHP Zack Kelly to a minor league contract.
Scouting Report
Statcast-style percentiles • Basenerd theme
Season 2026
Ready
Basic Line
Season / Game
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Pitch Arsenal
Usage • Velo • Break • Spin • xwOBA
Pitch N Use% Velo HB IVB Spin xwOBA Whiff% Zone% Chase% BNStuff+ BNCtrl+
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Notes
Primary pitch summary
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Movement Profile (Induced Break)
Pitcher's View: HB vs Rise / Drop (in)
Circles: 12/18/24 in • Dots = pitch types (size ~ pitch count)
Pitch Location Heatmaps
KDE-style blur • fixed zone • catcher POV
vs. LHH
vs. RHH
Zone: left -0.7083 / right 0.7083 • bot 1.595 / top 3.394 • Domain: X [-2,2], Z [0,5]
Statcast Game Log
Per-game pitch metrics from Statcast
Date Pitches Velo BNStuff+ BNCtrl+ Whiff% Zone% Chase% K% BB% xwOBA
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