2025 Stats
W-L
1-3
ERA
4.58
WHIP
1.33
K
35
SV
0
Rest-of-Season Projections
Signed a one-year contract with the Red Sox in March of 2025.
Receives September call-up
The Red Sox recalled Kelly from Triple-A Worcester on Monday, Tim Healey of The Boston Globe reports.
Analysis
Kelly will be back with the Red Sox for the first time since late June, as he had been on the shelf throughout July with an oblique injury before being activated and optioned to Worcester on Aug. 2. Since getting reinstated from the IL, Kelly had posted a meager 5.56 ERA and 1.32 WHIP in 11.1 innings out of the Worcester bullpen, so he'll likely be ticketed for low-leverage relief work with Boston.
Kelly will be back with the Red Sox for the first time since late June, as he had been on the shelf throughout July with an oblique injury before being activated and optioned to Worcester on Aug. 2. Since getting reinstated from the IL, Kelly had posted a meager 5.56 ERA and 1.32 WHIP in 11.1 innings out of the Worcester bullpen, so he'll likely be ticketed for low-leverage relief work with Boston.
Pitching Stats
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2025 MLB Game Log
2025
2024
2023
2022
Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
20
Last 10 Games
13
Last 5 Games
12
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 2023
-3%
BAA vs RHP
2025
-27%
BAA vs LHP
| BAA | K | BB | H | HR | ||||
|---|---|---|---|---|---|---|---|---|
| Since 2023vs Left | .231 | 41 | 27 | 39 | 7 | |||
| Since 2023vs Right | .225 | 61 | 20 | 47 | 6 | |||
| 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 | |||
| 2023vs Left | .222 | 4 | 6 | 4 | 0 | |||
| 2023vs Right | .214 | 2 | 2 | 3 | 0 | |||
| More Splits→ | View More Split Stats | |||||||
Home/Away Pitching Splits
Since 2023
Even Split
2025
-14%
ERA on Road
| ERA | WHIP | IP | K/9 | BB/9 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Since 2023Home | 4.17 | 1.48 | 54.0 | 8.5 | 5.0 | ||||
| Since 2023Away | 4.18 | 1.12 | 47.1 | 9.7 | 3.2 | ||||
| 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 | ||||
| 2023Home | 1.59 | 1.41 | 5.2 | 6.4 | 6.4 | ||||
| 2023Away | 7.36 | 1.91 | 3.2 | 4.9 | 9.8 | ||||
| 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
2.92K/9
8.9BB/9
3.1HR/9
0.8Fastball
97.0 mphERA
4.58WHIP
1.33BABIP
.331GB/FB
1.27Left On Base
60.7%Exit Velocity
79.0 mphBarrels/BBE
3.1%Spin Rate
2338 rpmBalls Hit 95+ MPH
18.3%Swinging Strike
9.2%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
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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Placed on 15-day IL
Kelly (oblique) was placed on the 15-day injured list Friday, and his prior option to Triple-A Worcester was rescinded, Chris Cotillo of MassLive.com reports.
Analysis
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Sent back to Triple-A
The Red Sox optioned Kelly (oblique) to Triple-A Worcester on Monday.
Analysis
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Tweaks oblique Sunday
Kelly was removed in the sixth inning of Sunday's game against the Blue Jays due to right oblique tightness, Ian Browne of MLB.com reports. He retired three of the seven batters he faced and allowed one earned run on two hits and one walk.
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.