Aaron Bummer
P | Bats/Throws: L/L | 6' 3" 215LBS | Age: 30
Draft: 2014 | Rd: 19, #558, Chicago White Sox | Nebraska
W L ERA G GS SV IP SO WHIP
2021 5 5 3.51 62 0 2 56.1 75 1.26
2022 2 1 2.36 32 0 2 26.2 30 1.50
2023 5 5 6.79 61 0 0 58.1 78 1.53
7 Seasons 14 15 3.84 289 0 5 272 309 1.31
G W-L ERA IP SO WHIP
2021 62 5-5 3.51 56.1 75 1.26
2022 32 2-1 2.36 26.2 30 1.50
2023 61 5-5 6.79 58.1 78 1.53
7 Seasons 289 14-15 3.84 272 309 1.31
MLB Percentile Rankings
Pitch Distribution

Statcast Statistics

Season Age Pitches Batted
Balls
Barrels Barrel % Barrel/PA Exit
Velocity
Max EV Launch
Angle
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 .332 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 .375 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 .265 .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 .356 .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
Player 4695 707 28 4.0 2.4 89.4 113.8 -3.3 22.8 .212 .300 .282 .278 .320 41.4 26.6 11.2
MLB 6.9 4.7 88.4 122.4 12.2 33.1 .245 .406 .316 .315 .369 36.3 22.1 8.4
! Note: All figures in this table cover the period 2015-present.

Statcast Pitch Arsenal

Bummer relies on 5 pitches.
Sinker
(45.3%) ,
Sweeper
(38%) ,
Cutter
(10.6%) ,
4-Seam Fastball
(5.6%) ,
Changeup
(0.5%) ,


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Pitch Tracking



Batted Ball Profile

Season GB % FB % LD % PU % Pull % Straight % Oppo % Weak % Topped % Under % Flare/Burner % Solid % Barrel % Barrel/PA
2017 56.9 20.7 17.2 5.2 25.9 39.7 34.5 3.4 53.4 19.0 15.5 0.0 6.9 4.4
2018 62.2 10.2 24.5 3.1 35.7 38.8 25.5 2.0 51.0 7.1 26.5 6.1 7.1 4.9
2019 71.4 10.3 15.4 2.9 35.4 41.1 23.4 3.4 58.9 10.9 17.7 5.7 2.3 1.5
2020 68.4 15.8 15.8 0.0 26.3 42.1 31.6 0.0 68.4 10.5 10.5 5.3 5.3 2.6
2021 76.9 9.7 11.2 2.2 29.1 39.6 31.3 7.5 53.0 9.0 23.1 2.2 2.2 1.2
2022 64.0 9.3 26.7 0.0 32.0 40.0 28.0 6.7 53.3 8.0 22.7 2.7 6.7 4.3
2023 60.1 16.2 21.6 2.0 29.1 37.2 33.8 6.8 45.3 14.2 25.7 4.7 2.7 1.5
Player 66.8 12.3 18.5 2.4 31.5 39.5 29.0 5.0 53.0 11.0 21.8 4.1 4.0 2.4
MLB 44.6 23.5 24.9 7.0 37.0 37.6 25.3 3.9 32.8 24.7 24.4 5.8 6.9 4.7
! Note: All figures in this table cover the period 2015-present.

Pitch Movement


How this works: Every pitch is affected by the forces of gravity, which means that every pitch drops on its way from the mound to the plate. These numbers are reported with gravity, which makes them larger and different than other pitch movement numbers you may have seen. Since gravity requires time, and slower pitches aren’t ‘better’ just because they have more time to move, the movement of a pitch is compared to ‘average’ movement by comparing it to other MLB pitch types within +/- 2 MPH and from within +/- 0.5 feet of extension and release.
Vertical Movement (inches) Horizontal Movement (inches)
Year Pitch Team Hand # MPH Inches of Drop vs Avg % vs Avg Inches of Break vs Avg % Break vs Avg
2023 Changeup CWS L 6 88.1 33.5 2.4 8 14.5 -0.2 -1
2023 Sweeper CWS L 418 82.5 43.0 4.0 10 16.6 2.4 17
2023 4-Seamer CWS L 61 94.7 19.1 -3.1 -20 11.1 2.1 23
2023 Cutter CWS L 116 87.2 35.0 -6.3 -22 3.0 0.6 28
2023 Sinker CWS L 498 94.3 28.7 4.3 18 14.5 -1.2 -8
2022 Cutter CWS L 38 86.3 36.9 -8.5 -30 4.4 2.3 109
2022 Sinker CWS L 291 94.5 28.8 5.3 23 14.2 -1.7 -11
2022 Sweeper CWS L 124 82.0 46.0 6.2 16 17.9 2.7 17
2022 Changeup CWS L 4 89.4 35.1 4.5 15 17.8 2.5 16
2021 Cutter CWS L 74 88.1 33.8 -6.2 -22 1.5 -0.5 -24
2021 Changeup CWS L 6 88.5 37.0 7.1 24 13.7 -1.1 -8
2021 Sweeper CWS L 281 83.0 45.1 4.8 12 17.9 3.8 27
2021 Sinker CWS L 588 95.4 29.2 7.8 36 15.4 0.1 1
2020 Sinker CWS L 132 95.7 28.5 8.1 40 13.8 -1.4 -9
2020 Sweeper CWS L 9 83.7 44.7 4.4 11 16.4 1.6 11
2020 Cutter CWS L 14 88.5 33.2 -6.5 -25 1.7 -0.3 -17
2019 4-Seamer CWS L 89 95.1 24.0 -8.7 -57 7.0 -1.1 -13
2019 Sweeper CWS L 34 84.9 36.2 -3.5 -9 14.3 -0.2 -2
2019 Changeup CWS L 6 89.4 33.5 5.2 19 11.5 -2.8 -20
2019 Cutter CWS L 171 88.5 34.2 -6.7 -24 2.8 0.8 37
2019 Sinker CWS L 703 95.6 27.3 6.5 31 12.1 -3.0 -20
2019 Slider CWS L 36 84.8 43.4 6.4 17 6.5 1.8 39
2018 Sinker CWS L 339 93.1 28.9 7.2 33 13.6 -1.1 -7
2018 Cutter CWS L 66 89.0 31.2 -4.4 -16 3.5 1.5 74
2018 Changeup CWS L 22 87.4 35.6 5.7 19 12.9 -1.0 -7
2018 Slider CWS L 118 83.0 45.1 5.2 13 5.6 0.2 3
2018 4-Seamer CWS L 64 92.8 20.6 -4.3 -27 6.9 -0.5 -6
2017 Sinker CWS L 170 93.2 26.3 6.0 29 12.2 -2.8 -19
2017 Changeup CWS L 7 88.5 27.3 1.1 4 12.6 -1.1 -8
2017 4-Seamer CWS L 59 93.7 17.6 -3.4 -24 7.3 -0.9 -11
2017 Slider CWS L 138 83.0 42.7 4.7 12 7.4 2.4 47
! Note: Years are in reverse order.
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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 %
2023 Sinker -0.8 -4 498 45.3 115 .323 .452 .403 15.4 9.6 12.4 .297 .397 .372 54.2
2023 Sweeper 1.1 5 418 38.0 117 .160 .245 .230 44.8 46.2 29.2 .151 .221 .216 30.8
2023 Cutter -0.1 0 116 10.6 10 .222 .556 .360 52.4 20.0 14.3 .340 .566 .414 28.6
2023 4-Seamer -1.3 -1 61 5.6 19 .214 .286 .345 31.6 47.4 28.1 .108 .130 .261 60.0
2023 Changeup 0.7 0 6 0.5 3 .333 .333 .300 66.7 66.7 50.0 .326 .374 .308 0.0
2022 Sinker -0.6 -2 291 63.7 71 .339 .484 .401 20.0 14.1 26.3 .285 .411 .352 55.8
2022 Sweeper 3.4 4 124 27.1 39 .143 .143 .169 42.2 51.3 33.9 .149 .187 .186 12.5
2022 Cutter -5.4 -2 38 8.3 6 .667 .667 .600 36.8 0.0 0.0 .557 .632 .526 33.3
2022 Changeup 3.0 0 4 0.9 1 .000 .000 .000 0.0 0.0 0.0 .529 1.144 .705 100.0
2021 Sinker -0.6 -4 591 61.4 136 .274 .336 .366 17.1 8.1 12.1 .258 .341 .336 47.6
2021 Sweeper 2.5 7 282 29.3 92 .094 .094 .149 52.2 67.4 32.3 .075 .087 .126 21.7
2021 Cutter -0.4 0 74 7.7 8 .375 .750 .257 52.8 25.0 20.0 .199 .320 .221 16.7
2021 Changeup -1.1 0 6 0.6 -- -- -- -- -- 0.0 -- -- -- --
2020 Sinker 1.5 2 132 85.2 27 .182 .182 .296 23.3 22.2 23.1 .206 .262 .297 50.0
2020 Cutter -5.1 -1 14 9.0 6 .167 .167 .150 50.0 50.0 50.0 .201 .616 .327 33.3
2020 Sweeper 7.4 1 9 5.8 5 .000 .000 .000 85.7 100.0 62.5 -- -- .000 --
2019 Sinker 2.8 20 703 67.7 183 .195 .268 .263 16.1 15.8 17.0 .201 .277 .257 39.7
2019 Cutter 1.4 2 171 16.5 44 .100 .125 .169 43.5 43.2 23.2 .131 .185 .203 33.3
2019 4-Seamer -0.9 -1 89 8.6 20 .353 .529 .430 24.4 20.0 13.8 .271 .440 .358 46.2
2019 Slider 3.5 1 36 3.5 6 .000 .000 .117 68.8 66.7 30.8 .089 .094 .184 0.0
2019 Sweeper 5.9 2 34 3.3 7 .143 .143 .129 35.7 57.1 28.6 .132 .150 .126 0.0
2019 Changeup 2.9 0 6 0.6 1 .000 .000 .000 0.0 0.0 -- .051 .073 .046 0.0
2018 Sinker -0.7 -2 339 55.7 94 .322 .391 .381 21.7 21.3 24.1 .274 .350 .306 47.8
2018 Slider -0.9 -1 118 19.4 20 .263 .316 .313 41.0 35.0 17.9 .277 .427 .357 41.7
2018 Cutter 0.7 0 66 10.8 13 .308 .462 .331 19.4 15.4 11.1 .219 .336 .240 9.1
2018 4-Seamer -2.5 -2 64 10.5 10 .286 .429 .425 8.7 10.0 6.3 .318 .836 .545 66.7
2018 Changeup 5.0 1 22 3.6 7 .143 .143 .129 50.0 71.4 50.0 .099 .103 .089 0.0
2017 Sinker 2.5 4 170 45.5 46 .086 .114 .238 20.8 13.0 15.4 .188 .222 .296 26.7
2017 Slider -0.5 -1 138 36.9 32 .222 .444 .335 44.8 28.1 20.5 .238 .430 .334 36.8
2017 4-Seamer 0.5 0 59 15.8 10 .222 .556 .360 15.0 20.0 14.3 .224 .574 .367 28.6
2017 Changeup -19.1 -1 7 1.9 2 1.000 3.000 1.625 0.0 0.0 -- .604 1.524 .868 100.0
! Note: Years are in reverse order.
! Note: To better align with other values, positive numbers (red) are good, and negative numbers (blue) are poor.
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Spin Direction

Year Pitch Type Pitches MPH Active Spin % Total Movement (In.) Spin-Based Observed Deviation
2023 Cutter 115 87.2 18 4.0 1:45 3:15 -90
2023 4-Seam Fastball 61 94.7 81 15.7 10:00 10:30 -30
2023 Sinker 477 94.3 86 15.4 10:00 9:00 60
2023 Sweeper 415 82.5 69 18.2 4:00 3:30 30
2022 Cutter 38 86.3 23 5.4 2:30 3:45 -75
2022 Sinker 273 94.4 79 15.1 10:00 9:15 45
2022 Sweeper 124 82.0 79 20.3 4:00 3:45 15
2021 Cutter 72 88.0 17 2.5 1:45 3:00 -75
2021 Sinker 523 95.4 83 16.2 10:00 9:00 60
2021 Sweeper 279 83.0 82 20.2 4:15 3:45 30
2020 Cutter 11 88.4 30 2.9 1:15 2:15 -60
2020 Sinker 77 95.6 79 15.0 10:15 9:00 75
! Note: This table is showing data from the PITCHER perspective.
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Swing/Take

Runs
Year Team PA Pitches Heart Shadow Chase Waste All
2017 90 374 3 6 -3 -4 2
2018 144 609 2 2 -5 -3 -3
2019 261 1,039 23 11 -4 -5 25
2020 44 179 1 1 -1 1 2
2021 252 1,012 6 6 -7 -3 3
2022 117 457 4 4 -5 -3 1
2023 264 1,099 0 10 -4 -7 0
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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 23.8 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 31.9 7.7 69.9
2022 457 47.9 54.8 81.7 23.1 50.9 42.2 53.0 38.3 27.4 7.0 65.6
2023 1,099 47.8 53.5 80.8 27.7 44.0 44.3 60.6 40.0 32.0 6.8 56.0
Player 4,695 48.5 59.7 82.4 26.2 46.3 41.3 57.8 42.4 28.4 7.6 67.2
MLB 48.6 67.0 82.0 28.5 58.0 42.6 60.9 47.1 24.8 7.3 76.1
! 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 42 29 83 9 42
2020 86 9 54
2021 96 96 100 100 74 99 99 64 26 89 12 85 30 80 8 32
2022 62 13 48
2023 76 79 95 98 23 99 99 43 11 87 4 87 35 56 5 56
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Expected Home Runs

Year Team Avg HR Trot Actual HR xHR HR-xHR Doubters Mostly Gone No Doubters No Doubter %
2017 21.7 4 3.0 1 0 2 2 50.0
2018 25.1 1 1.8 -1 5 3 0 0.0
2019 22.9 4 4.4 0 1 4 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 3.2 1 2 3 1 25.0
Player 22.7 18 16.1 2 11 15 6 33.3

Expected Home Runs by Park

Year HR
2017 4 3 3 3 3 3 4 2 3 2 4 4 3 4 3 3 2 2 4 3 4 3 3 3 2 2 3 3 3 3 2
2018 1 3 1 1 1 1 2 1 1 0 1 3 5 0 1 3 1 1 1 2 3 3 4 3 0 1 1 2 5 1 1
2019 4 5 2 5 4 5 6 5 2 3 3 4 6 5 6 4 5 4 4 4 5 2 6 5 5 5 3 5 6 5 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 3 3 3 4 4 3 2 2 3 3 3 2 4 3 3 3 5 4 3 4 5 4 3 2 3 3 3 3 3
Player 18 18 13 17 15 17 20 15 10 10 14 19 20 15 18 17 15 14 18 17 19 16 23 19 14 13 14 17 20 15 10
! Note: This tells how many of this player's home runs would have been out of other stadiums. This accounts for different wall heights, distances and environmental effects. For these purposes, the 2020 Blue Jays home field was still Rogers Centre, not Sahlen Field.
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Year to Year Changes

Metric 2017 2018 +/-   2019 +/-   2020 +/-   2021 +/-   2022 +/-   2023 +/-  
Fastball Velocity 93.4 92.5 -0.9 94.3 1.8 95.0 0.7 94.6 -0.4 93.6 -1.0 93.1 -0.5
Offspeed Velocity 88.5 87.4 -1.1 89.4 2.0 0.0 0.0 88.5 0.0 89.4 0.9 88.1 -1.3
Breaking Velocity 83.0 83.0 0.0 84.9 1.9 83.7 -1.2 83.0 -0.7 82.0 -1.0 82.5 0.5
Exit Velocity 86.8 90.7 3.9 89.6 -1.1 94.2 4.6 88.2 -6.0 90.2 2.0 89.2 -1.0
Launch Angle 4.4 0.7 -3.7 -2.7 -3.4 -8.7 -6.0 -10.9 -2.2 -3.5 7.4 -2.0 1.5
Barrel % 6.9 7.1 0.2 2.3 -4.8 5.3 3.0 2.2 -3.1 6.7 4.5 2.7 -4.0
Hard Hit % 32.8 42.9 10.1 38.3 -4.6 47.4 9.1 41.7 -5.7 45.3 3.6 44.6 -0.7
Sweet Spot % 22.4 30.6 8.2 18.3 -12.3 21.1 2.8 14.2 -6.9 30.7 16.5 27.0 -3.7
xBA .222 .262 0.040 .189 -0.073 .174 -0.015 .179 0.005 .257 0.078 .218 -0.039
BA .178 .301 0.123 .184 -0.117 .152 -0.032 .202 0.050 .288 0.086 .236 -0.052
xwOBA .329 .308 -0.021 .246 -0.062 .263 0.017 .249 -0.014 .308 0.059 .293 -0.015
wOBA .303 .323 0.020 .235 -0.088 .208 -0.027 .257 0.049 .328 0.071 .313 -0.015
xSLG .378 .372 -0.006 .265 -0.107 .287 0.022 .234 -0.053 .356 0.122 .303 -0.053
SLG .370 .376 0.006 .252 -0.124 .152 -0.100 .250 0.098 .375 0.125 .347 -0.028
K% 18.7 24.3 5.6 22.8 -1.5 36.8 14.0 31.0 -5.8 25.6 -5.4 29.2 3.6
BB% 16.5 6.9 -9.6 9.5 2.6 13.2 3.7 12.0 -1.2 8.5 -3.5 13.5 5.0
Swing % 40.6 43.5 2.9 47.3 3.8 38.7 -8.6 42.4 3.7 38.3 -4.1 40.0 1.7
Whiff% 28.9 23.8 -5.1 24.2 0.4 35.0 10.8 31.9 -3.1 27.4 -4.5 32.0 4.6
In Zone % 43.9 50.6 6.7 51.1 0.5 43.9 -7.2 48.1 4.2 47.9 -0.2 47.8 -0.1
Out of Zone % 56.1 49.4 -6.7 48.9 -0.5 56.1 7.2 51.9 -4.2 52.1 0.2 52.2 0.1
Out of Zone Swing % 23.8 24.3 0.5 27.4 3.1 29.9 2.5 26.1 -3.8 23.1 -3.0 27.7 4.6
First Pitch Swing % 15.6 25.0 9.4 25.3 0.3 18.4 -6.9 25.0 6.6 22.2 -2.8 19.3 -2.9
First Pitch Strike % 51.1 53.5 2.4 59.4 5.9 57.9 -1.5 60.4 2.5 53.0 -7.4 60.6 7.6
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Statcast Fielder Positioning

vs RHHvs LHH
YearAlignment TypePAwOBAPATotal%PATotal%
2017 Shifts 90 .303 42 6 14.3 48 26 54.2
2018 Shifts 144 .323 87 12 13.8 57 21 36.8
2019 Shifts 261 .235 166 10 6.0 95 27 28.4
2020 Shifts 38 .208 25 0 0.0 13 2 15.4
2021 Shifts 235 .259 162 3 1.9 73 10 13.7
2022 Shifts 117 .328 70 6 8.6 47 4 8.5
2023 Shades 263 .311 172 6 3.5 91 5 5.5
! 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%
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Pitch Distribution