2025 Stats
W-L
1-1
ERA
9.00
WHIP
1.40
K
11
SV
0
Rest-of-Season Projections
Optioned to Triple-A
The Red Sox optioned Kelly to Triple-A Worcester on Tuesday.
ANALYSIS
He's clearing out to make room on the roster for the return of Brayan Bello (shoulder). Kelly has permitted 10 runs over 10 innings this season, although that's come with an 11:2 K:BB. He'll get another opportunity later on this season.
He's clearing out to make room on the roster for the return of Brayan Bello (shoulder). Kelly has permitted 10 runs over 10 innings this season, although that's come with an 11:2 K:BB. He'll get another opportunity later on this season.
Pitching Stats
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2025
2024
2023
2022
Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
23
Last 10 Games
23
Last 5 Games
27
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
-11%
BAA vs RHP
2025
-36%
BAA vs LHP
| BAA | K | BB | H | HR | |
|---|---|---|---|---|---|
| Since 2023vs Left | .236 | 34 | 22 | 30 | 7 |
| Since 2023vs Right | .209 | 44 | 15 | 33 | 4 |
| 2025vs Left | .222 | 4 | 1 | 4 | 0 |
| 2025vs Right | .348 | 7 | 1 | 8 | 1 |
| 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 |
Home/Away Pitching Splits
Since 2023
-13%
ERA on Road
2025
-76%
ERA on Road
| ERA | WHIP | IP | K/9 | BB/9 | |
|---|---|---|---|---|---|
| Since 2023Home | 4.91 | 1.54 | 40.1 | 9.1 | 4.9 |
| Since 2023Away | 4.29 | 1.07 | 35.2 | 9.3 | 3.8 |
| 2025Home | 20.25 | 3.00 | 2.2 | 10.1 | 3.4 |
| 2025Away | 4.91 | 0.82 | 7.1 | 9.8 | 1.2 |
| 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 |
Minor League Left/Right Pitching Splits (AAA)
Since 2023
-56%
BAA vs RHP
2025
-17%
BAA vs RHP
| BAA | K | BB | H | HR | |
|---|---|---|---|---|---|
| Since 2023vs Left | .194 | 12 | 8 | 7 | 3 |
| Since 2023vs Right | .086 | 12 | 8 | 3 | 1 |
| 2025vs Left | .267 | 5 | 2 | 4 | 2 |
| 2025vs Right | .222 | 3 | 5 | 2 | 0 |
| 2024vs Left | .056 | 7 | 6 | 1 | 0 |
| 2024vs Right | .000 | 6 | 2 | 0 | 0 |
| 2023vs Left | .667 | 0 | 0 | 2 | 1 |
| 2023vs Right | .167 | 3 | 1 | 1 | 1 |
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
5.50K/9
9.9BB/9
1.8HR/9
0.9Fastball
95.8 mphERA
9.00WHIP
1.40BABIP
.390GB/FB
1.50Left On Base
31.7%Exit Velocity
79.2 mphBarrels/BBE
5.0%Spin Rate
2326 rpmBalls Hit 95+ MPH
25.0%Swinging Strike
10.3%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
Set to be optioned to Triple-A
The Red Sox will option Kelly to Triple-A Worcester prior to Tuesday's game against the Mariners, Chris Cotillo of MassLive.com reports.
ANALYSIS
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Secures bullpen spot
Manager Alex Cora announced Tuesday that Kelly has made the Opening Day roster, Ian Browne of MLB.com reports.
ANALYSIS
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Sent to minors
The Red Sox optioned Kelly to Triple-A Worcester on Saturday, Julian McWilliams of The Boston Globe reports.
ANALYSIS
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Bound for Worcester
The Red Sox will option Kelly to Triple-A Worcester on Saturday, Chris Cotillo of MassLive.com reports.
ANALYSIS
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Tosses three scoreless frames
Kelly did not factor in the decision Monday against Toronto after issuing two walks over three scoreless innings as the opener. He struck out four batters during the loss.
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.