Aaron Bummer
26-Year-Old PitcherRP
2020 Fantasy Outlook
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. Read Past Outlooks
$Signed a five-year, $16 million extension with the White Sox in February of 2020.
Nails down bullpen spot
PChicago White Sox
March 19, 2020
Bummer is considered a lock to make the White Sox's bullpen, Scott Merkin of MLB.com reports. He's struck out five and walked two with no hits allowed over four scoreless spring innings.
ANALYSIS
Bummer is the poster child for spring training stats don't matter. After surrendering nine runs and 11 hits in six spring innings during the 2019 Cactus League, he became the White Sox's most reliable reliever in the regular season. He claimed the setup role from Kelvin Herrera and earned 27 holds while posting a 2.13 ERA. The White Sox were so impressed, they re-signed the left-hander to a five-year deal in February. Bummer from the left and Steve Cishek from the right give opposing batters different looks in the late innings.
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Pitching Stats
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2019
2018
2017
2019 MLB Game Log
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2018 MLB Game Log
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2017 MLB Game Log
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Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
18
Last 10 Games
17
Last 5 Games
12
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 2017
 
 
-16%
BAA vs LHP
2019
 
 
-5%
BAA vs LHP
2018
 
 
-28%
BAA vs LHP
2017
 
 
-9%
BAA vs LHP
BAA Batters K BB H 2B 3B HR
Since 2017vs Left .196 199 44 13 36 6 0 3
Since 2017vs Right .234 298 68 36 60 5 1 6
2019vs Left .178 94 21 4 16 2 0 1
2019vs Right .188 168 39 20 27 2 0 3
2018vs Left .245 57 15 3 13 3 0 0
2018vs Right .338 87 20 7 27 2 1 1
2017vs Left .171 48 8 6 7 1 0 2
2017vs Right .188 43 9 9 6 1 0 2
More Splits View More Split Stats
Home/Away Pitching Splits
Since 2017
 
 
-48%
ERA at Home
2019
 
 
-27%
ERA at Home
2018
 
 
-63%
ERA at Home
2017
 
 
-63%
ERA at Home
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2017Home 2.23 1.02 68.2 1 3 1 8.5 2.8 0.8
Since 2017Away 4.27 1.42 52.2 0 1 0 8.0 4.8 0.5
2019Home 1.80 1.03 35.0 0 0 1 8.0 3.3 0.8
2019Away 2.48 0.95 32.2 0 0 0 8.0 3.0 0.3
2018Home 2.66 0.98 20.1 0 1 0 10.2 0.9 0.4
2018Away 7.15 2.65 11.1 0 0 0 9.5 6.4 0.0
2017Home 2.70 1.05 13.1 1 2 0 7.4 4.1 1.4
2017Away 7.27 1.62 8.2 0 1 0 6.2 9.3 2.1
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.
  • 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
2.50
 
K/9
8.0
 
BB/9
3.2
 
HR/9
0.5
 
Fastball
95.6 mph
 
ERA
2.13
 
WHIP
0.99
 
BABIP
.230
 
GB/FB
4.67
 
Left On Base
81.4%
 
Exit Velocity
89.4 mph
 
Barrels/BBE
2.4%
 
Spin Rate
2028 rpm
 
Balls Hit 95+ MPH
39.5%
 
Swinging Strike
10.6%
 
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
2019
2018
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
Lands extension with White Sox
PChicago White Sox
February 22, 2020
Bummer signed a five year, $16 million contract extension with the White Sox on Saturday, Bob Nightengale of USA Today reports.
ANALYSIS
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Picks up 16th hold
PChicago White Sox
August 16, 2019
Bummer tossed two scoreless innings and struck out one in Friday's 7-2 win over the Angels.
ANALYSIS
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No runs allowed in second half
PChicago White Sox
July 28, 2019
Bummer walked one in a scoreless two-thirds of an inning in Saturday's 5-1 win over the Twins.
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Earns 10th hold
PChicago White Sox
July 8, 2019
Bummer allowed a solo home run and a walk over two innings to pick up the hold in Sunday's 3-1 win over the Cubs.
ANALYSIS
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Has closing stuff per manager
PChicago White Sox
June 30, 2019
White Sox manager Rick Renteria feels Bummer can be a closer, David Just of the Chicago Sun-Times reports.
ANALYSIS
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