2025 Stats
W-L
1-2
ERA
3.89
WHIP
1.27
K
42
SV
0
Rest-of-Season Projections
2025 Fantasy Outlook
Bummer tossed his sweeper a career-high 42 percent of the time in 2024. It was a logical decision to make it his primary offering, as it has been his most effective pitch ever since he implemented it back in 2019. The southpaw still threw plenty of sinkers and the occasional cutter to produce one of the highest groundball rates (61.3 percent, 98th percentile) in the league, but it appears a near 30 percent K-rate is likely to stick moving forward. This should elevate Bummer on Atlanta's bullpen hierarchy, especially after the team signed him to a 2-year, $13 million deal in November. The 31-year-old's career 1.33 WHIP is a concern, but he should be back in the mix for holds after recording just two last year. Read Past Outlooks

Struggles as opener Saturday
Bummer allowed three runs on four hits and no walks while striking out one batter over two innings in a no-decision as an opener against St. Louis on Saturday.
Analysis
Bummer was tabbed to open the bullpen game for Atlanta and gave the team two innings. While he was able to keep the ball in the strike zone, throwing 21 of 33 pitches for strikes and issuing zero free passes, he was tagged for three runs in the second frame, with two of the runs coming on a Nolan Gorman homer. It's not yet clear how Atlanta plans to fill the rotation spot that opened when Spencer Schwellenbach (elbow) landed on the injured list in early July, so Bummer could be called upon to fill the same role after the All-Star break, though the team figures to eventually settle upon a traditional starter.
Bummer was tabbed to open the bullpen game for Atlanta and gave the team two innings. While he was able to keep the ball in the strike zone, throwing 21 of 33 pitches for strikes and issuing zero free passes, he was tagged for three runs in the second frame, with two of the runs coming on a Nolan Gorman homer. It's not yet clear how Atlanta plans to fill the rotation spot that opened when Spencer Schwellenbach (elbow) landed on the injured list in early July, so Bummer could be called upon to fill the same role after the All-Star break, though the team figures to eventually settle upon a traditional starter.
Pitching Stats
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2025 MLB Game Log
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2022
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Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
21
Last 10 Games
25
Last 5 Games
30
How many pitches does Aaron Bummer 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 Aaron Bummer 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 LHP
2025
-4%
BAA vs RHP
BAA | K | BB | H | HR | ||||
---|---|---|---|---|---|---|---|---|
Since 2023vs Left | .249 | 75 | 23 | 56 | 3 | |||
Since 2023vs Right | .256 | 114 | 45 | 94 | 6 | |||
2025vs Left | .250 | 22 | 6 | 17 | 1 | |||
2025vs Right | .241 | 20 | 8 | 19 | 2 | |||
2024vs Left | .266 | 27 | 6 | 21 | 2 | |||
2024vs Right | .284 | 42 | 12 | 40 | 0 | |||
2023vs Left | .231 | 26 | 11 | 18 | 0 | |||
2023vs Right | .238 | 52 | 25 | 35 | 4 | |||
More Splits→ | View More Split Stats |
Home/Away Pitching Splits
Since 2023
-34%
ERA at Home
2025
-73%
ERA at Home
ERA | WHIP | IP | K/9 | BB/9 | |||||
---|---|---|---|---|---|---|---|---|---|
Since 2023Home | 3.95 | 1.33 | 82.0 | 12.8 | 3.2 | ||||
Since 2023Away | 5.96 | 1.54 | 71.0 | 9.1 | 4.9 | ||||
2025Home | 1.71 | 0.95 | 21.0 | 11.6 | 1.7 | ||||
2025Away | 6.38 | 1.64 | 18.1 | 7.4 | 4.9 | ||||
2024Home | 2.48 | 1.13 | 32.2 | 12.1 | 1.4 | ||||
2024Away | 5.16 | 1.85 | 22.2 | 9.9 | 5.2 | ||||
2023Home | 7.31 | 1.84 | 28.1 | 14.6 | 6.4 | ||||
2023Away | 6.30 | 1.23 | 30.0 | 9.6 | 4.8 | ||||
More Splits→ | View More Split Stats |
Stat Review
How does Aaron Bummer 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
9.6BB/9
3.2HR/9
0.7Fastball
91.2 mphERA
3.89WHIP
1.27BABIP
.324GB/FB
2.86Left On Base
63.3%Exit Velocity
82.2 mphBarrels/BBE
2.6%Spin Rate
2296 rpmBalls Hit 95+ MPH
25.3%Swinging Strike
10.0%Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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Past Fantasy Outlooks
2024
2023
2022
2021
2020
2019
2018
Bummer had one of his worst statistical seasons over his seven-year career in 2023. His 6.79 ERA was highest in the league among qualified relievers, while his 1.53 WHIP was 12th-worst. This is mostly due to an elevated 13.5% walk rate (his worst since his rookie season), high BABIP (.340) and poor 55.4% left-on-base percentage. However, Bummer's inflated ERA was far worse than his 3.58 xERA, suggesting he should rebound in that category. The veteran is still one of the best in the league at inducing ground balls, but Bummer threw fewer sinkers (45% pitch usage) last season in favor of more sweepers (38%). This adjustment yielded a career-high 78 strikeouts, which speaks to the upside the southpaw possesses. Bummer was recently traded to Atlanta, where he could emerge as one of the team's top setup options in 2024.
More Fantasy News

Opening Saturday's contest
Bummer will serve as Atlanta's opening pitcher in a bullpen game Saturday against the Cardinals.
Analysis
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Starting bullpen game Saturday
Bummer will serve as the opening pitcher in a bullpen game for Atlanta in Saturday's matchup with the Orioles, Mark Bowman of MLB.com reports.
Analysis
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Returns from bereavement list
Atlanta activated Bummer from the bereavement list Monday.
Analysis
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Goes on bereavement list
Atlanta placed Bummer on the bereavement list Friday.
Analysis
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Takes loss in relief
Bummer (0-1) took the loss against the Padres on Saturday, allowing one run on one hit and one walk while striking out two across two-thirds of an inning.
Analysis
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Latest Fantasy Rumors

Staying put
Bummer won't be traded at this year's deadline, Bob Nightengale of USA Today reports.
Analysis
Teams keep asking about Dylan Cease and Bummer, but the White Sox will be keeping both pitchers in the fold. With Kendall Graveman and Reynaldo Lopez out of the picture and Keynan Middleton also likely to be dealt, it will be Bummer and Gregory Santos handling the high-leverage work while closer Liam Hendriks is on the shelf with an elbow issue.
Teams keep asking about Dylan Cease and Bummer, but the White Sox will be keeping both pitchers in the fold. With Kendall Graveman and Reynaldo Lopez out of the picture and Keynan Middleton also likely to be dealt, it will be Bummer and Gregory Santos handling the high-leverage work while closer Liam Hendriks is on the shelf with an elbow issue.