2026 Stats
W-L
0-1
ERA
5.68
WHIP
0.95
K
3
SV
0
Rest-of-Season Projections
Signed a one-year contract with the Red Sox in March of 2026.
Succeeds in high-leverage spot
Kelly retired both batters he faced in the seventh inning to earn a hold in Tuesday's 3-2 win over Milwaukee.
Analysis
Kelly entered a high-leverage situation that might normally be entrusted to Justin Slaten, but Slaten was unavailable due to an oblique injury. With Boston leading, 3-1, the bases loaded and one out, Kelly limited the damage to one run on a pair of groundouts and recorded his first hold. In three appearances since being called up from Triple-A Worcester last week, the right-handed reliever has allowed one run and one hit while striking out one over 2.2 innings. The 31-year-old Kelly is a well-known commodity in the bullpen, having made 98 appearances for the Red Sox over the previous four seasons.
Kelly entered a high-leverage situation that might normally be entrusted to Justin Slaten, but Slaten was unavailable due to an oblique injury. With Boston leading, 3-1, the bases loaded and one out, Kelly limited the damage to one run on a pair of groundouts and recorded his first hold. In three appearances since being called up from Triple-A Worcester last week, the right-handed reliever has allowed one run and one hit while striking out one over 2.2 innings. The 31-year-old Kelly is a well-known commodity in the bullpen, having made 98 appearances for the Red Sox over the previous four seasons.
Pitching Stats
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2026 MLB Game Log
2026
2025
2024
2023
2022
Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
16
Last 10 Games
16
Last 5 Games
18
How many pitches does Zack Kelly generally throw?
1-10
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90
91-100
101-110
111-120
121+
What part of the game does Zack Kelly generally pitch?
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
Extra
% Games Reaching Innings Threshold
% Games By Number of Innings Pitched
Left/Right Pitching Splits
Since 2024
-6%
BAA vs RHP
2026
-44%
BAA vs RHP
| BAA | K | BB | H | HR | ||||
|---|---|---|---|---|---|---|---|---|
| Since 2024vs Left | .236 | 38 | 21 | 37 | 8 | |||
| Since 2024vs Right | .223 | 61 | 19 | 47 | 6 | |||
| 2026vs Left | .333 | 1 | 0 | 2 | 1 | |||
| 2026vs Right | .188 | 2 | 1 | 3 | 0 | |||
| 2025vs Left | .217 | 11 | 6 | 13 | 0 | |||
| 2025vs Right | .297 | 24 | 6 | 22 | 3 | |||
| 2024vs Left | .242 | 26 | 15 | 22 | 7 | |||
| 2024vs Right | .182 | 35 | 12 | 22 | 3 | |||
| More Splits→ | View More Split Stats | |||||||
Home/Away Pitching Splits
Since 2024
-1%
ERA on Road
2026
-76%
ERA at Home
| ERA | WHIP | IP | K/9 | BB/9 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Since 2024Home | 4.33 | 1.42 | 52.0 | 8.3 | 4.5 | ||||
| Since 2024Away | 4.27 | 1.08 | 46.1 | 9.9 | 2.7 | ||||
| 2026Home | 2.45 | 0.55 | 3.2 | 2.5 | 0.0 | ||||
| 2026Away | 10.13 | 1.50 | 2.2 | 6.8 | 3.4 | ||||
| 2025Home | 4.96 | 1.59 | 16.1 | 7.2 | 5.0 | ||||
| 2025Away | 4.26 | 1.11 | 19.0 | 10.4 | 1.4 | ||||
| 2024Home | 4.22 | 1.44 | 32.0 | 9.6 | 4.8 | ||||
| 2024Away | 3.65 | 1.01 | 24.2 | 9.9 | 3.6 | ||||
| More Splits→ | View More Split Stats | ||||||||
Stat Review
How does Zack Kelly compare to other relievers?
This section compares his stats with all relief pitcher seasons from the previous three seasons (minimum 30 innings)*. The bar represents the player's percentile rank. For example, if the bar is halfway across, then the player falls into the 50th percentile for that stat and it would be considered average.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
K/BB
3.00K/9
4.3BB/9
1.4HR/9
1.4Fastball
96.2 mphERA
5.68WHIP
0.95BABIP
.212GB/FB
2.00Left On Base
43.5%Exit Velocity
84.3 mphBarrels/BBE
14.3%Spin Rate
2279 rpmBalls Hit 95+ MPH
35.7%Swinging Strike
7.2%Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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2023 Fantasy Outlook
Kelly was a journeyman reliever earlier in his minor-league career. He gained fastball velocity during the off year in 2020 and came back racking up the strikeouts in 2021 and 2022, culminating with him fanning 72 batters (34.4 percent) in 49.2 innings at Triple-A Worcester before earning his MLB debut last season. In addition to his mid-90s fastball, Kelly sports a plus changeup that has similar movement characteristics to Devin Williams' famous "airbender" changeup. Kelly probably won't get saves as a rookie, but he could offer value in leagues where relievers who post good ratios and strikeouts are useful.
More Fantasy News
Summoned from minors
The Red Sox recalled Kelly from Triple-A Worcester on Friday, Chris Cotillo of MassLive.com reports.
Analysis
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Sent to minor-league camp
The Red Sox optioned Kelly to minor-league camp Monday.
Analysis
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Receives September call-up
The Red Sox recalled Kelly from Triple-A Worcester on Monday, Tim Healey of The Boston Globe reports.
Analysis
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Reinstated, optioned to Worcester
The Red Sox reinstated Kelly (oblique) from the injured list Saturday and optioned him to Triple-A Worcester.
Analysis
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Set to begin rehab assignment
Kelly (oblique) will begin a rehab assignment with High-A Greenville on Thursday, Chris Cotillo of MassLive.com reports.
Analysis
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Latest Fantasy Rumors
Should soon return to majors
Chris Cotillo of The Springfield Republican expects Kelly's stay at Triple-A Worcester to be a short one after being optioned Sunday.
Analysis
The right-hander has a 2.16 ERA and 1.26 WHIP across 16.2 innings for Boston this season, so it's only a matter of time before he's back in the big-league bullpen. Kelly likely won't be in the high-leverage mix for the Red Sox anytime soon, but it's not completely out of the question if the club trades away the likes of Kenley Jansen and Chris Martin, both of whom are pending free agents, this summer.
The right-hander has a 2.16 ERA and 1.26 WHIP across 16.2 innings for Boston this season, so it's only a matter of time before he's back in the big-league bullpen. Kelly likely won't be in the high-leverage mix for the Red Sox anytime soon, but it's not completely out of the question if the club trades away the likes of Kenley Jansen and Chris Martin, both of whom are pending free agents, this summer.