Select a bullpen:
Arizona Bullpen
Atlanta Bullpen
Chicago Bullpen
Cincinnati Bullpen
Colorado Bullpen
Los Angeles Bullpen
Miami Bullpen
Milwaukee Bullpen
New York Bullpen
Philadelphia Bullpen
Pittsburgh Bullpen
San Diego Bullpen
San Francisco Bullpen
St Louis Bullpen
Washington Bullpen
Baltimore Bullpen
Boston Bullpen
Chicago Bullpen
Cleveland Bullpen
Detroit Bullpen
Houston Bullpen
Kansas City Bullpen
Los Angeles Bullpen
Minnesota Bullpen
New York Bullpen
Athletics Bullpen
Seattle Bullpen
Tampa Bay Bullpen
Texas Bullpen
Toronto Bullpen

National League:
Arizona Bullpen
Atlanta Bullpen
Chicago Bullpen
Cincinnati Bullpen
Colorado Bullpen
Los Angeles Bullpen
Miami Bullpen
Milwaukee Bullpen
New York Bullpen
Philadelphia Bullpen
Pittsburgh Bullpen
San Diego Bullpen
San Francisco Bullpen
St Louis Bullpen
Washington Bullpen
American League:
Baltimore Bullpen
Boston Bullpen
Chicago Bullpen
Cleveland Bullpen
Detroit Bullpen
Houston Bullpen
Kansas City Bullpen
Los Angeles Bullpen
Minnesota Bullpen
New York Bullpen
Athletics Bullpen
Seattle Bullpen
Tampa Bay Bullpen
Texas Bullpen
Toronto Bullpen

Team bullpen data and usage tracking

Zack Kelly
Zack Kelly
Throws: R
Primary Role(s): Reliever
Age: 30

Boston
Team Record: 41 - 44
Head Coach: Alex Cora
Pitching Coach: Andrew Bailey
Pitcher Snapshot
Pitcher Impact Rating:
67.8
IP (last 7 gm):
4
ERA (last 7 gm):
4.50
Team BP Power Rank:
#26

Pitcher Season Stats

Cumulative Stats
Season G ERA IP PA P/pa SO/pa BB/pa HR/pa SB/pa G/AO AVG OBP xWOBA OPS
2025 17 5.56 22.20 103 3.69 24.3% 8.7% 1.9% 1% 1.1 0.273 0.356 0.308 0.788
2025 SpringTr 7 2.35 7.20 27 3.74 29.6% 3.7% 0.0% 1% 1.33 0.154 0.185 - 0.377
2025: Home 7 10.57 7.20 44 3.50 11.4% 15.9% 0.0% 0% 1.25 0.344 0.500 - 0.938
2025: Away 10 3.00 15.00 59 3.83 33.9% 3.4% 3.4% 1% 1 0.232 0.254 - 0.683
2025: Vs L 17 - 10.00 46 3.70 17.4% 10.9% 0.0% % 1 0.243 0.356 - 0.707
2025: Vs R 17 - 12.20 57 3.79 29.8% 7.0% 3.5% % 1.22 0.294 0.357 - 0.847
2025 Pitch Arsenal
Game Logs
Game Date Opponent IP PA R H 2B 3B HR BB SO SB CS NP-S AVG
2025-06-29 vs Blue Jays 1.00
 7 1 2 1 0 0 1 1 0 0 28-16 0.27
2025-06-25 @ Angels 1.20
6
 7 0 2 1 0 0 0 4 0 0 31-21 0.27
2025-06-22 @ Giants 1.10
7
 7 1 3 0 0 1 0 0 0 0 23-17 0.26
2025-06-20 @ Giants 0.20
6
 3 0 0 0 0 0 1 2 0 0 14-8 0.25
2025-06-17 @ Mariners 1.20
4
 5 0 0 0 0 0 0 2 1 0 16-11 0.25
2025-06-09 vs Rays 1.00
11
 7 2 1 0 0 0 3 1 0 0 23-12 0.27
2025-06-08 @ Yankees 0.10
8
 3 0 2 1 0 0 0 0 0 0 9-4 0.27
Advanced Stats
Advanced Stats will be released after the All-Star break

Bullpen Usage & Stats

Last 7 Days
Player IP NP-S ERA Jun-29 Jun-28 Jun-27 Jun-26 Jun-25 Jun-24 Jun-23
Zack Kelly 2.2 59-37 4.50
1.0
28-16
1.2
6
31-21
Justin Wilson 0.1 7-5 27.27
0.1
10
7-5
Aroldis Chapman 2.0 32-23 0.00
1.0
12-9
1.0
9
20-14
Brennan Bernardino 2.2 53-31 16.92
1.0
4-4
1.0
7
38-19
0.2
5
11-8
Jorge Alcala 2.0 41-25 0.00
0.2
8
13-9
1.0
8
18-9
0.1
8
10-7
Chris Murphy 2.0 31-18 0.00
2.0
8
31-18
Greg Weissert 2.0 31-20 6.77
1.0
14-8
1.0
8
17-12
Garrett Whitlock 2.2 52-35 13.53
1.0
10-8
1.2
7
42-27
Kutter Crawford 0 0-0 9.00
Garrett Crochet 0 0-0 0.00
Richard Fitts 0 0-0 7.20
Hunter Dobbins 0 0-0 5.59
Luis Guerrero 3.0 70-35 12.00
0.1
7
19-10
0.2
5
26-11
2.0
5
25-14
IP
In
NP-S
IP
In
NP-S
IP
In
NP-S
IP
In
NP-S
IP
In
NP-S
IP
In
NP-S
IP
In
NP-S
Advanced Pitcher Traits
Games Pitched this Season:
17
Games Started this Season:
0
Pitchers versus LH batters:
Yes
Pitchers versus RH batters:
Yes
Avg Inning when called:
6
Avg Run Diff when called:
2.65
Pitches over 30 pitches:
Yes
Pitches before the 8th:
Yes
Pitches back to back days:
Rarely
Other Boston Pitchers

Justin Wilson (L)
Aroldis Chapman (L)
Brennan Bernardino (L)
Jorge Alcala (R)
Chris Murphy (L)
Greg Weissert (R)
Garrett Whitlock (R)
Zack Kelly (R)
Luis Guerrero (R)

Premium Member Services & Donations

About Our Site Privacy Policy Contact Us

Terms of Use DMCA Policy

SOCIAL

RECOMMENDED SITES
IndepthStats - LineupVault

Inside the Pen Inside t Pen™

©2022-2026 InsidethePen.com
All rights reserved

All MLB player headshots are licensed via Imagn/USA TODAY Sports.
All images remain the property of their copyright holders.

All team logos are the trademark & property of their respective owners and not InsidethePen.com. We present them here in an editorial context for informational and educational purposes.