Aaron Bummer
P | Bats/Throws: L/L | 6' 3" 215LBS | Age: 31
Draft: 2014 | Rd: 19, #558, Chicago White Sox | Nebraska
W L ERA G GS SV IP SO WHIP
2023 5 5 6.79 61 0 0 58.1 78 1.53
2024 4 3 3.58 56 0 0 55.1 69 1.43
2025 0 1 3.60 12 0 0 15 18 1.27
9 Seasons 18 19 3.79 357 0 5 342.1 396 1.32
G W-L ERA IP SO WHIP
2023 61 5-5 6.79 58.1 78 1.53
2024 56 4-3 3.58 55.1 69 1.43
2025 12 0-1 3.60 15 18 1.27
9 Seasons 357 18-19 3.79 342.1 396 1.32
MLB Percentile Rankings
Movement Profile (Induced Break)
?

Statcast Statistics

Season Age Pitches Batted
Balls
Barrels Barrel % Barrel/PA Exit
Velocity
Max EV Launch
Angle
LA Sweet-
Spot %
XBA XSLG WOBA XWOBA XWOBACON HardHit% K% BB% ERA xERA
2017 23 374 58 4 6.9 4.4 86.8 111.3 4.4 22.4 .222 .378 .303 .329 .331 32.8 18.7 16.5 4.50 4.70
2018 24 609 98 7 7.1 4.9 90.7 109.8 0.7 30.6 .262 .372 .323 .308 .374 42.9 24.3 6.9 4.26 4.01
2019 25 1039 175 4 2.3 1.5 89.6 110.3 -2.7 18.3 .189 .264 .235 .246 .264 38.3 22.8 9.5 2.13 2.62
2020 26 155 19 1 5.3 2.6 94.2 109.0 -8.7 21.1 .174 .287 .208 .263 .342 47.4 36.8 13.2 0.96 2.88
2021 27 962 134 3 2.2 1.2 88.2 110.6 -10.9 14.2 .179 .234 .257 .249 .289 41.7 31.0 12.0 3.52 2.58
2022 28 457 75 5 6.7 4.3 90.2 113.2 -3.5 30.7 .257 .355 .328 .308 .370 45.3 25.6 8.5 2.36 3.94
2023 29 1099 148 4 2.7 1.5 89.2 113.8 -2.0 27.0 .218 .303 .313 .293 .342 44.6 29.2 13.5 6.79 3.58
2024 30 974 155 2 1.3 0.8 86.6 112.4 0.0 29.0 .232 .283 .305 .261 .328 32.9 28.3 7.4 3.58 2.80
2025 31 265 39 1 2.6 1.6 88.9 105.1 -0.8 30.8 .204 .280 .280 .235 .295 46.2 28.1 9.4 3.60 2.03
Player 5934 901 31 3.4 2.1 88.9 113.8 -2.6 24.2 .215 .296 .286 .274 .320 40.2 26.9 10.5
MLB 7.0 4.8 88.5 122.4 12.3 33.2 .245 .405 .316 .315 .368 36.6 22.2 8.4
! Note: All figures in this table cover the period 2015-present.

Statcast Pitch Arsenal

Bummer relies on 4 pitches.
Sinker
(34.3%) ,
Sweeper
(30.2%) ,
Curveball
(23.4%) ,
Four Seamer
(12.1%) ,


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Pitch Tracking



Batted Ball Profile

AIR: Fly Balls + Line Drives + Popups All Batted Balls Batted Ball Breakdown
Season GB % AIR % FB % LD % PU % Pull % Straight % Oppo % Pull GB % Straight GB % Oppo GB % Pull AIR % Straight AIR % Oppo AIR %
2017 56.9 43.1 20.7 17.2 5.2 25.9 39.7 34.5 19.0 24.1 13.8 6.9 15.5 20.7
2018 62.2 37.8 10.2 24.5 3.1 35.7 38.8 25.5 25.5 24.5 12.2 10.2 14.3 13.3
2019 71.4 28.6 10.3 15.4 2.9 35.4 41.1 23.4 28.0 30.9 12.6 7.4 10.3 10.9
2020 68.4 31.6 15.8 15.8 0.0 26.3 42.1 31.6 15.8 31.6 21.1 10.5 10.5 10.5
2021 76.9 23.1 9.7 11.2 2.2 29.1 39.6 31.3 25.4 29.1 22.4 3.7 10.4 9.0
2022 64.0 36.0 9.3 26.7 0.0 32.0 40.0 28.0 22.7 25.3 16.0 9.3 14.7 12.0
2023 60.1 39.9 16.2 21.6 2.0 29.1 37.2 33.8 19.6 21.6 18.9 9.5 15.5 14.9
2024 61.3 38.7 9.0 25.8 3.9 37.4 39.4 23.2 26.5 23.9 11.0 11.0 15.5 12.3
2025 61.5 38.5 17.9 20.5 0.0 41.0 38.5 20.5 25.6 33.3 2.6 15.4 5.1 17.9
Player 65.6 34.4 12.0 19.9 2.6 33.0 39.4 27.6 24.3 26.4 14.9 8.7 13.0 12.8
MLB 44.4 55.6 23.8 24.7 7.1 37.2 37.4 25.2 20.6 17.8 5.9 16.6 19.7 19.3
! Note: All figures in this table cover the period 2015-present.

Quality of Contact

Season Weak % Topped % Under % Flare/Burner % Solid % Barrel % Barrel/PA
2017 3.4 53.4 19.0 15.5 0.0 6.9 4.4
2018 2.0 51.0 7.1 26.5 6.1 7.1 4.9
2019 3.4 58.9 10.9 17.7 5.7 2.3 1.5
2020 0.0 68.4 10.5 10.5 5.3 5.3 2.6
2021 7.5 53.0 9.0 23.1 2.2 2.2 1.2
2022 6.7 53.3 8.0 22.7 2.7 6.7 4.3
2023 6.8 45.3 14.2 25.7 4.7 2.7 1.5
2024 9.7 43.2 11.0 29.7 4.5 1.3 0.8
2025 5.1 43.6 15.4 25.6 7.7 2.6 1.6
Player 5.8 50.9 11.2 23.3 4.3 3.4 2.1
MLB 3.9 32.6 24.8 24.4 5.9 7.0 4.8
! Note: All figures in this table cover the period 2015-present.

Pitch Movement


How this works: This section shows two different ways to evaluate pitch movement. On the left, “Total Movement” shows the real-world movement of a pitch, including the forces of gravity, which affects every pitch thrown. Since gravity requires time, and slower pitches aren't 'better' just because they have more time to move, a pitch's movement is compared to other pitches of the same pitch type, within +/- 2 MPH and +/- 0.5 feet of extension/release. On the right, Induced Movement (or IVB) is reported without gravity, and attempts to isolate movement created by the pitcher's ability to spin and manipulate the ball.
Total Movement (in inches, w/ gravity)Induced Movement (in inches, w/o gravity)
YearPitchTeamHand#MPHVertical
Drop
vs.
Comparable
Horizontal
Break
vs.
Comparable
Vertical
Break
vs. AvgHorizontal
Break
vs. Avg
2025 Sweeper ATL L 80 81.2 43.5 3.7 15.4GLV 0.9 -1.8 2.6 15.4GLV 1.8
2025 Sinker ATL L 91 91.2 31.8 5.0 14.5ARM -1.7 1.2 6.4 14.5ARM -1.0
2025 4-Seam Fastball ATL L 32 92.0 21.1 -3.3 8.8ARM -1.1 11.1 -5.1 8.8ARM 0.7
2025 Curveball ATL L 62 81.1 51.1 0.8 13.6GLV 3.3 -9.3 0.0 13.6GLV 5.4
2024 Sweeper ATL L 407 82.3 41.2 2.1 15.1GLV 0.8 -0.7 1.8 15.1GLV 1.0
2024 Curveball ATL L 22 82.2 48.5 -0.2 10.0GLV 0.4 -8.1 -0.4 10.0GLV 2.9
2024 Changeup ATL L 11 84.2 35.6 1.7 15.0ARM 0.8 2.8 3.1 15.0ARM 0.9
2024 4-Seam Fastball ATL L 97 93.6 20.7 -3.5 11.1ARM 1.3 10.4 -5.3 11.1ARM 3.0
2024 Sinker ATL L 388 93.1 31.3 5.7 15.2ARM -0.6 0.3 7.9 15.2ARM 0.1
2024 Cutter ATL L 49 87.4 32.7 -4.7 2.5GLV 0.9 3.1 -4.1 2.5GLV 0.5
! Note: Years are in reverse order.

Run Values by Pitch Type

Year Pitch Type Team RV/100 Run Value Pitches % PA BA SLG wOBA Whiff% K% PutAway % xBA xSLG xwOBA Hard Hit %
2025 Sinker 0.9 1 91 34.3 19 .278 .444 .329 13.3 15.8 20.0 .245 .306 .263 73.3
2025 Sweeper -2.4 -2 80 30.2 17 .385 .615 .409 25.0 29.4 14.3 .196 .245 .230 20.0
2025 Curveball 3.6 2 62 23.4 19 .111 .167 .150 32.4 36.8 21.2 .147 .272 .206 36.4
2025 4-Seam Fastball 2.0 1 32 12.1 6 .167 .167 .150 13.3 50.0 27.3 .270 .300 .250 33.3
2024 Sweeper 0.7 3 407 41.8 99 .213 .255 .244 43.9 48.5 30.4 .202 .234 .208 20.8
2024 Sinker 0.0 0 388 39.8 94 .361 .482 .408 10.8 7.4 10.9 .277 .333 .316 41.6
2024 4-Seam Fastball 1.9 2 97 10.0 30 .192 .231 .255 24.5 33.3 21.7 .186 .250 .255 25.0
2024 Cutter -3.0 -1 49 5.0 13 .385 .692 .458 23.5 23.1 42.9 .279 .409 .297 40.0
2024 Curveball -0.8 0 22 2.3 3 .000 .000 .233 20.0 33.3 8.3 .000 .000 .331 0.0
2024 Changeup 0.0 0 11 1.1 3 .333 .333 .300 12.5 0.0 0.0 .228 .283 .211 33.3
! Note: Years are in reverse order.
! Note: To better align with other values, positive numbers (red) are good, and negative numbers (blue) are poor.

Spin Direction

Year Pitch Type Pitches MPH Active Spin % Total Movement (In.) Spin-Based Observed Deviation
2025 Curveball 62 81.1 80 18.5 4:00 4:15 -15
2025 4-Seam Fastball 32 92.0 73 13.8 10:15 10:30 -15
2025 Sinker 89 91.1 73 15.2 10:00 9:00 60
2025 Sweeper 80 81.2 72 16.8 3:45 3:30 15
2024 Changeup 11 84.2 92 15.8 9:45 9:15 30
2024 Curveball 20 82.2 75 14.7 4:00 4:30 -30
2024 Cutter 49 87.4 20 4.0 12:30 1:45 -75
2024 4-Seam Fastball 93 93.7 82 15.0 10:00 10:15 -15
2024 Sinker 363 93.1 83 16.0 9:45 9:00 45
2024 Sweeper 404 82.3 69 16.2 3:45 3:15 30
! Note: Years are in reverse order.
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! Note: This table is showing data from the PITCHER perspective.
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Pitcher Arm Angle

! Note: Data is available from 2020 through the present.
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Statcast Pitching Run Value

Runs
Year Team PA Pitches Heart Shadow Chase Waste All
2017 90 374 -1 6 -4 -4 -3
2018 144 609 2 3 -4 -3 -3
2019 261 1,039 18 11 -5 -6 18
2020 38 155 2 2 -1 0 3
2021 236 953 6 10 -6 -4 6
2022 117 457 4 3 -5 -3 -1
2023 264 1,099 0 14 -5 -6 3
2024 242 974 5 5 -4 -2 3
2025 61 265 4 0 -2 0 2
Player 1,453 5,925 39 53 -35 39 29
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Plate Discipline

Season Pitches Zone % Zone Swing % Zone Contact % Chase % Chase Contact % Edge % 1st Pitch Strike % Swing % Whiff % Meatball % Meatball Swing %
2017 374 43.9 62.2 81.4 23.8 48.0 40.4 51.1 40.6 28.9 7.5 57.1
2018 609 50.6 62.3 83.9 24.3 52.1 37.4 53.5 43.5 24.5 8.7 66.0
2019 1,039 51.1 66.3 84.1 27.4 53.2 41.6 59.4 47.3 24.2 8.2 80.0
2020 155 43.9 50.0 79.4 29.9 46.2 41.3 57.9 38.7 35.0 7.1 63.6
2021 962 48.1 60.5 81.9 26.1 35.7 39.8 60.4 42.4 32.1 7.7 69.9
2022 457 47.9 54.8 81.7 23.1 50.9 42.2 53.0 38.3 28.0 7.0 65.6
2023 1,099 47.8 53.5 80.8 27.7 44.0 44.3 60.6 40.0 32.5 6.8 56.0
2024 974 47.8 58.6 80.6 28.7 58.9 45.0 57.4 43.0 26.7 7.0 64.7
2025 265 50.2 54.9 86.3 31.1 56.1 44.2 58.1 43.0 22.8 7.9 61.9
Player 5,934 48.5 59.3 82.3 26.8 49.0 42.0 57.8 42.5 28.1 7.5 66.6
MLB 48.7 67.0 82.0 28.4 57.7 42.6 61.1 47.2 25.0 7.3 76.3
! Note: All figures in this table cover the period 2015-present.

Percentile Rankings

Year xwOBA /
xERA
xBA xSLG xISO xOBP Brl Brl% EV Hard
Hit%
K% BB% Whiff% Chase
Rate
FB
Velo
FB
Spin
CB
Spin
Extension
2017 58 3 36
2018 52 6 41
2019 98 94 99 100 89 99 99 23 35 51 29 41 29 83 9 43
2020 86 9 55
2021 96 96 100 100 74 99 99 64 26 89 12 85 30 79 8 32
2022 62 13 48
2023 75 79 95 98 23 99 99 43 11 87 4 89 35 56 5 56
2024 92 59 98 100 71 100 100 91 90 84 59 59 50 35 39 33
2025 97 86 95 94 80 92 94 58 19 80 44 34 75 12 34 20 44
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Expected Home Runs

Adjusted

Year Team Avg HR Trot Actual HR xHR HR-xHR Doubters Mostly Gone No Doubters No Doubter %
2017 21.7 4 2.9 1 0 2 2 50.0
2018 25.1 1 1.6 -1 6 2 0 0.0
2019 22.9 4 3.6 0 0 3 2 50.0
2020 -- 0 0.0 0 1 0 0 --
2021 22.6 3 2.0 1 1 1 1 33.3
2022 24.6 2 1.7 0 1 2 0 0.0
2023 21.9 4 3.1 1 2 3 1 25.0
2024 23.7 2 1.5 1 0 2 0 0.0
Player 22.8 20 16.4 4 11 15 6 30.0
Note: xHR tells how many of this pitcher's home runs allowed would have been out of other stadiums. The "Adjusted" view here accounts for different wall heights, distances and environmental effects using Statcast Park Factor data.
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Expected Home Runs by Park

Adjusted

Year HR
2017 4 3 3 2 3 3 4 2 3 2 4 3 3 4 3 3 2 2 3 3 4 3 3 3 2 2 3 3 3 3 2
2018 1 3 1 1 1 1 1 1 1 0 1 3 5 0 1 3 0 1 1 2 3 3 3 3 0 0 1 2 5 1 1
2019 4 4 2 4 3 4 5 5 2 2 2 3 4 4 5 4 4 4 3 3 4 2 5 4 4 4 2 4 5 4 2
2020 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
2021 3 2 2 3 2 2 2 2 1 2 2 3 2 2 2 2 2 2 2 2 2 2 3 2 2 2 2 2 2 2 1
2022 2 2 1 2 2 2 2 2 1 1 1 2 1 2 2 2 2 2 2 2 2 2 2 2 2 1 2 2 1 1 1
2023 4 3 2 3 3 3 4 3 2 2 3 3 3 2 4 3 3 3 5 3 3 4 5 4 3 2 3 3 3 3 3
2024 2 1 1 2 2 2 2 1 1 2 2 2 2 0 1 2 2 1 1 2 1 1 2 1 2 1 2 2 2 2 0
Player 20 18 13 17 16 17 20 16 11 11 15 19 20 14 18 19 15 15 17 17 19 17 23 19 15 12 15 18 21 16 10
Note: xHR tells how many of this pitcher's home runs allowed would have been out of other stadiums. The "Adjusted" view here accounts for different wall heights, distances and environmental effects using Statcast Park Factor data.
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Year to Year Changes

Metric 2017 +/-   2018 +/-   2019 +/-   2020 +/-   2021 +/-   2022 +/-   2023 +/-   2024 +/-   2025
Fastball Velocity 93.4 -0.9 92.5 1.8 94.3 0.7 95.0 -0.4 94.6 -1.0 93.6 -0.5 93.1 -0.4 92.7 -1.3 91.4
Offspeed Velocity 88.5 -1.1 87.4 2.0 89.4 0.0 0.0 0.0 88.5 0.9 89.4 -1.3 88.1 -3.9 84.2 0.0 0.0
Breaking Velocity 83.0 0.0 83.0 1.9 84.9 -1.2 83.7 -0.7 83.0 -1.0 82.0 0.5 82.5 -0.2 82.3 -1.1 81.2
Exit Velocity 86.8 3.9 90.7 -1.1 89.6 4.6 94.2 -6.0 88.2 2.0 90.2 -1.0 89.2 -2.6 86.6 2.3 88.9
Launch Angle 4.4 -3.7 0.7 -3.4 -2.7 -6.0 -8.7 -2.2 -10.9 7.4 -3.5 1.5 -2.0 2.0 0.0 -0.8 -0.8
Barrel % 6.9 0.2 7.1 -4.8 2.3 3.0 5.3 -3.1 2.2 4.5 6.7 -4.0 2.7 -1.4 1.3 1.3 2.6
Hard Hit % 32.8 10.1 42.9 -4.6 38.3 9.1 47.4 -5.7 41.7 3.6 45.3 -0.7 44.6 -11.7 32.9 13.3 46.2
LA Sweet-Spot % 22.4 8.2 30.6 -12.3 18.3 2.8 21.1 -6.9 14.2 16.5 30.7 -3.7 27.0 2.0 29.0 1.8 30.8
xBA .222 0.040 .262 -0.073 .189 -0.015 .174 0.005 .179 0.078 .257 -0.039 .218 0.014 .232 -0.028 .204
BA .178 0.123 .301 -0.117 .184 -0.032 .152 0.050 .202 0.086 .288 -0.052 .236 0.041 .277 -0.041 .236
xwOBA .329 -0.021 .308 -0.062 .246 0.017 .263 -0.014 .249 0.059 .308 -0.015 .293 -0.032 .261 -0.026 .235
wOBA .303 0.020 .323 -0.088 .235 -0.027 .208 0.049 .257 0.071 .328 -0.015 .313 -0.008 .305 -0.025 .280
xSLG .378 -0.006 .372 -0.108 .264 0.023 .287 -0.053 .234 0.121 .355 -0.052 .303 -0.020 .283 -0.003 .280
SLG .370 0.006 .376 -0.124 .252 -0.100 .152 0.098 .250 0.125 .375 -0.028 .347 0.017 .364 0.000 .364
K% 18.7 5.6 24.3 -1.5 22.8 14.0 36.8 -5.8 31.0 -5.4 25.6 3.6 29.2 -0.9 28.3 -0.2 28.1
BB% 16.5 -9.6 6.9 2.6 9.5 3.7 13.2 -1.2 12.0 -3.5 8.5 5.0 13.5 -6.1 7.4 2.0 9.4
Swing % 40.6 2.9 43.5 3.8 47.3 -8.6 38.7 3.7 42.4 -4.1 38.3 1.7 40.0 3.0 43.0 0.0 43.0
Whiff% 28.9 -4.4 24.5 -0.3 24.2 10.8 35.0 -2.9 32.1 -4.1 28.0 4.5 32.5 -5.8 26.7 -3.9 22.8
In Zone % 43.9 6.7 50.6 0.5 51.1 -7.2 43.9 4.2 48.1 -0.2 47.9 -0.1 47.8 0.0 47.8 2.4 50.2
Out of Zone % 56.1 -6.7 49.4 -0.5 48.9 7.2 56.1 -4.2 51.9 0.2 52.1 0.1 52.2 0.0 52.2 -2.4 49.8
Out of Zone Swing % 23.8 0.5 24.3 3.1 27.4 2.5 29.9 -3.8 26.1 -3.0 23.1 4.6 27.7 1.0 28.7 2.4 31.1
First Pitch Swing % 15.6 9.4 25.0 0.3 25.3 -6.9 18.4 6.6 25.0 -2.8 22.2 -2.9 19.3 5.1 24.4 -9.9 14.5
First Pitch Strike % 51.1 2.4 53.5 5.9 59.4 -1.5 57.9 2.5 60.4 -7.4 53.0 7.6 60.6 -3.2 57.4 0.7 58.1
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Statcast Fielder Positioning

vs RHHvs LHH
YearAlignment TypePAwOBAPATotal%PATotal%
2017 Shifts 90 .303 42 4 9.5 48 19 39.6
2018 Shifts 144 .323 87 3 3.4 57 11 19.3
2019 Shifts 261 .235 166 7 4.2 95 17 17.9
2020 Shifts 38 .208 25 0 0.0 13 2 15.4
2021 Shifts 236 .258 163 2 1.2 73 6 8.2
2022 Shifts 117 .328 70 4 5.7 47 4 8.5
2023 Shades 263 .311 172 6 3.5 91 5 5.5
2024 Shades 242 .305 155 5 3.2 87 29 33.3
2025 Shades 61 .280 33 0 0.0 28 19 67.9
! Note: Shifts are through the 2022 season, Shaded starting from the 2023 season, Shift: three or more infielders are on the same side of second base, Shade: positioned outside of their typical responsible slices of the field.
Learn more about how positioning is defined here

Pitch Tempo

Bases EmptyRunners On Base
SeasonTeamPitchesTempoFast %Slow %PitchesTempoFast %Slow %
2017 127 17.0 16.5% 4.7% 57 19.8 0.0% 10.5%
2018 123 18.2 7.3% 0.8% 158 21.9 0.0% 4.4%
2019 271 19.5 5.9% 1.8% 207 23.5 0.5% 8.2%
2020 44 21.3 0.0% 2.3% 39 23.5 0.0% 7.7%
2021 294 22.4 0.3% 6.5% 177 24.2 0.0% 8.5%
2022 97 22.9 0.0% 4.1% 150 25.1 0.0% 10.7%
2023 252 16.8 17.5% 1.2% 281 19.1 3.9% 0.7%
2024 235 15.5 37.9% 0.0% 227 17.9 9.7% 0.4%
2025 57 15.2 47.4% 0.0% 40 16.8 17.5% 0.0%

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Pitch Distribution



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