Aaron Bummer

Aaron Bummer

30-Year-Old PitcherRP
Atlanta Braves
2024 Fantasy Outlook
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. Read Past Outlooks
RANKSFrom Preseason
#362
ADP
$Signed a five-year, $16 million contract extension with the White Sox in February of 2020. Traded to Atlanta in November of 2023.
Collects second win
PAtlanta Braves
June 7, 2024
Bummer (2-2) picked up the win Thursday over the Nationals, striking out one in a perfect seventh inning.
ANALYSIS
The southpaw set down the bottom of Washington's order on 13 pitches (eight strikes), and Atlanta took its first lead of the game in the top of the eighth. Bummer isn't seeing the high-leverage work he grew accustomed to with the White Sox, and he's still looking for his first hold of the season. After a bumpy start to the campaign, he's been tagged for earned runs in only one of 10 appearances since the beginning of May, posting a 1.64 ERA, 1.09 WHIP and 12:3 K:BB through 11 innings over that stretch.
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Pitching Stats
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2024
2023
2022
2021
2020
2019
2018
2017
2024 MLB Game Log
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2023 MLB Game Log
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2022 MLB Game Log
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2021 MLB Game Log
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2020 MLB Game Log
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2019 MLB Game Log
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2018 MLB Game Log
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Pitching Appearances Breakdown
Average Pitch Count
18
Last 10 Games
18
Last 5 Games
16
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+
 
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+
 
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
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
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 2022
 
 
-2%
BAA vs LHP
2024
 
 
-25%
BAA vs RHP
2023
 
 
-3%
BAA vs LHP
2022
 
 
-28%
BAA vs LHP
BAA Batters K BB H 2B 3B HR
Since 2022vs Left .258 176 48 21 39 9 0 1
Since 2022vs Right .264 309 86 33 71 10 0 6
2024vs Left .353 37 10 3 12 1 0 1
2024vs Right .263 64 16 5 15 2 0 0
2023vs Left .231 92 26 11 18 7 0 0
2023vs Right .238 175 52 25 35 6 0 4
2022vs Left .231 47 12 7 9 1 0 0
2022vs Right .323 70 18 3 21 2 0 2
More Splits View More Split Stats
Home/Away Pitching Splits
Since 2022
 
 
-1%
ERA on Road
2024
 
 
-47%
ERA at Home
2023
 
 
-14%
ERA on Road
2022
 
 
-40%
ERA at Home
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2022Home 5.01 1.67 50.1 1 4 0 12.9 4.8 0.4
Since 2022Away 4.97 1.38 58.0 8 4 2 9.6 4.2 0.8
2024Home 2.38 1.24 11.1 0 0 0 11.9 1.6 0.0
2024Away 4.50 1.75 12.0 2 2 0 8.3 4.5 0.8
2023Home 7.31 1.84 28.1 1 3 0 14.6 6.4 0.6
2023Away 6.30 1.23 30.0 4 2 0 9.6 4.8 0.6
2022Home 1.69 1.69 10.2 0 1 0 9.3 4.2 0.0
2022Away 2.81 1.38 16.0 2 0 2 10.7 2.8 1.1
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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.
  • K/BB
    Strikeout to walk ratio.
  • K/9
    Average strikeouts per nine innings.
  • BB/9
    Average walks per nine innings.
  • HR/9
    Average home runs allowed per nine innings.
  • Fastball
    Average fastball velocity.
  • ERA
    Earned run average. The average earned runs allowed per nine innings.
  • WHIP
    Walks plus hits per inning pitched.
  • BABIP
    Batting average on balls in play. Measures how many balls in play against a pitcher go for hits.
  • GB/FB
    Groundball to flyball ratio. The higher the number, the more likely a pitcher is to induce groundballs.
  • Left On Base
    The percentage of base runners that a pitcher strands on base over the course of a season.
  • Exit Velocity
    The speed of the baseball as it comes off the bat, immediately after a batter makes contact.
  • Barrels/BBE
    The percentage of batted ball events resulting in a Barrel. A Barrel is a batted ball with similar exit velocity and launch angle to past ones that led to a minimum .500 batting average and 1.500 slugging percentage.
  • Spin Rate
    Spin Rate is the rate of spin on a baseball after it is released. It is measured in revolutions per minute (rpm).
  • Balls Hit 95+ MPH
    The percentage of batted balls hit that met or exceeded the 95 MPH threshold.
  • Swinging Strike
    The percentage of pitches that result in a swing and a miss.
K/BB
3.25
 
K/9
10.0
 
BB/9
3.1
 
HR/9
0.4
 
Fastball
93.5 mph
 
ERA
3.47
 
WHIP
1.50
 
BABIP
.395
 
GB/FB
4.75
 
Left On Base
74.4%
 
Exit Velocity
81.5 mph
 
Barrels/BBE
0.0%
 
Spin Rate
2336 rpm
 
Balls Hit 95+ MPH
22.2%
 
Swinging Strike
8.9%
 
Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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Latest Fantasy Rumors
Staying put
PChicago White Sox
July 29, 2023
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.
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Past Fantasy Outlooks
2023
2022
2021
2020
2019
2018
Bummer required two IL stints in 2022, first a minimum stay early in the season for a sore knee, then a more lengthy 3-month absence due to a shoulder/lat injury. This limited the southpaw to only 26.2 innings last season. Injuries appear to be part of the package for the 29-year-old, who has now missed time on the IL during each of the past three years. When healthy, Bummer is adept at inducing ground balls, as his career rate is 67.6%, which is roughly 25% above league average. He walks about four batters per nine innings, though, and the frequent grounders could lead to some BABIP and ratio instability. However, Bummer's role as one of the White Sox primary setup men appears secure, so expect him to provide holds as long as he's healthy.
Bummer proved that his small-sample spike in strikeouts in 2020 wasn't a fluke, as he was once again able to top a 30 K% in 2021 across 56.1 innings. Even better was that he didn't sacrifice his primary identity as a groundball pitcher by turning in his third consecutive season with a groundball rate over 65%. Unsurprisingly, that has helped him limit home runs, and he's been able to limit hitters to 0.6 HR/9 across 187 career innings. In most cases, that combination of skills would lead to a pitcher receiving a look as closer, though Bummer has largely been limited to a setup role throughout his career. That isn't likely to change in 2022, as the White Sox boast a tremendous trio in the back of their bullpen in Liam Hendriks, Craig Kimbrel and Kendall Graveman. While we expect Kimbrel to get dealt at some point later in the offseason, Bummer's value is still likely tied to his strong ratios and plenty of strikeouts.
The closer job for the White Sox briefly opened up after Alex Colome left in free agency, but despite his recent success Bummer was denied a chance to compete for it when the club signed Liam Hendriks. It's tough to get too excited about the 27-year-old lefty's 2020 campaign, as bicep issues limited him to just nine appearances, but Bummer was excellent when available, posting a 0.96 ERA and a 36.8 K%. It's difficult to expect anything close to a repeat of that performance in 2021 given the size of the sample and the fact that he posted a rather modest 22.9 K% during his breakout 2019 campaign. Still, that's now two years where he's looked like a high-leverage option, with an elite 71.7% groundball rate over that stretch keeping him in that tier despite modest numbers elsewhere. He doesn't have a traditional closer's profile, but Bummer should remain in the late-inning mix.
Bummer spent the previous two seasons as an unremarkable middle reliever for the White Sox, but he turned into a high-leverage option in his age-26 season and recorded 27 holds. Overall he had a 2.13 ERA and 0.99 WHIP across 67.2 innings, and he held both righties and lefties to a sub-.200 average. The left-hander interestingly saw his strikeout rate drop (22.9%) and his walk rate rise (9.2%), but he relied much more heavily on his fastball (76.4% usage) and saw an uptick in velocity (95.5 mph) to help induce a 72.1% groundball rate. Barring any free-agent additions, Bummer should enter spring training in the setup role to closer Alex Colome, who went 30-for-33 in save opportunities.
After vaulting up the organizational ladder in 2017, Bummer was rewarded with an Opening Day roster spot. Early on, the southpaw was used almost exclusively in one- or two-batter stints, largely as a specialist. The results were promising, as he posted a 3.26 ERA and a 21:6 K:BB in 19.1 frames before being shuttled back to the minors. He returned to the big leagues for the month of September and was touched up a bit to the tune of eight runs in 12.1 innings. Despite the struggles at the end, 2018 was largely a success for the 25-year-old. His 65:21 K:BB in 61.2 innings between the majors and minors was strong, and he held left-handed hitters to a .245 batting average. Plus, his 2.44 FIP fell well below his 4.26 ERA for the season, suggesting he was the subject of some bad luck. He figures to have a role in the middle innings in 2019.
Last season marked the first complete campaign for Bummer since he underwent Tommy John surgery in 2015. The White Sox started him at High-A, and he pitched at four levels last season while eventually getting the call to Chicago. In the minors, he struck out a batter per inning at each of his three stops, but he struggled to miss bats as a big-league reliever in his debut. Additionally, his walk rate spiked to a career-worst 6.1 BB/9, which kept the White Sox from relying on him in high-leverage spots. There are a few positives, however, including a track record of better control and his ability to get outs on the ground (54.4 percent groundball rate). With a low-90s fastball and slider combo, Bummer should get more opportunities to stick with the White Sox in 2018, but he may wind up bouncing between Charlotte and Chicago if he fails to cut back on the free passes.
More Fantasy News
Nabs win Monday
PAtlanta Braves
April 16, 2024
Bummer (1-1) was credited with the win Monday against the Astros, giving up one hit in a scoreless two-thirds of an inning.
ANALYSIS
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Tagged with loss Sunday
PAtlanta Braves
April 1, 2024
Bummer (0-1) got charged with a blown save and took the loss Sunday against the Phillies, giving up two runs on four hits while striking out one in the seventh inning.
ANALYSIS
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Mixed results this spring
PAtlanta Braves
March 15, 2024
Bummer gave up a run on two hits while striking out two in an inning of relief during Thursday's Grapefruit League game against the Rays.
ANALYSIS
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Dealt to Atlanta
PAtlanta Braves
November 16, 2023
Bummer was traded from the White Sox to Atlanta on Thursday in exchange for Michael Soroka (forearm), Jared Shuster, Nicky Lopez, Braden Shewmake and Riley Gowens.
ANALYSIS
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Getting looks in high leverage
PChicago White Sox
August 19, 2023
Bummer has recorded three holds in his last five appearances for the White Sox.
ANALYSIS
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