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Aaron Bummer

#36 - Relief Pitcher

Kansas City Royals

Bats / Throws Left / Left
Date of Birth 9/21/1993 (32)
Height, Weight 6'3", 215 lb
Hometown Valencia, CA

2026 Season Stats

MLB Rank MLB Average
Sv IP ERA WHIP K% BB%
0 16.1 8.82 1.96 15.5% 11.9%
200th 2
Sv
319th 38.0
IP
335th 4.29
ERA
330th 1.35
WHIP
289th 22.4%
K%
286th 9.9%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
90.3 9.7% 26.3% 48.1% 4.5% 4.92 4.07
315th 94.7
FB MPH
246th 12.1%
SwStr%
230th 28.4%
CSW%
310th 50.9%
Str-ICR
144th 4.7%
MTK%
242nd 4.93
PLV
284th 3.52
PLA

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Aaron Bummer Overview

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team G GS IP W-L Sv Hld ERA WHIP xERA FIP xFIP PLA K% BB% H/9 HR/9 BABIP HR/FB% LOB% ICR% GB% SwStr% CSW% IPR% PLV
2017 CHW 30 0 22.0 1-3 0 - 4.50 1.27 - 6.16 - - 18.7% 16.5% 5.3 1.64 .170 - 76.9% - - - - - -
2018 CHW 37 0 31.2 0-1 0 2 4.26 1.58 - 2.39 - 0.00 24.3% 6.9% 11.4 0.28 .402 - 64.5% - - 11.0% 27.8% 0.44 -
2019 CHW 58 0 67.2 0-0 1 27 2.13 0.99 - 3.41 - 0.00 22.8% 9.5% 5.7 0.53 .229 - 82.3% - - 11.5% 27.5% 0.48 -
2020 CHW 9 0 9.1 1-0 0 3 0.96 1.07 1.75 1.76 2.70 4.73 36.8% 13.2% 4.8 0.00 .263 0.0% 90.0% 21.1% 73.7% 13.5% 37.4% 0.76 4.64
2021 CHW 62 0 56.1 5-5 2 21 3.51 1.26 2.63 2.96 2.84 3.57 31.0% 12.0% 6.7 0.48 .298 25.0% 66.4% 27.6% 78.5% 13.6% 33.1% 0.62 5.02
2022 CHW 32 0 26.2 2-1 2 10 2.36 1.50 3.60 3.19 2.98 3.79 25.6% 8.5% 10.1 0.67 .384 22.2% 79.1% 30.7% 67.6% 10.7% 31.9% 0.50 4.89
2023 CHW 61 0 58.1 5-5 0 15 6.79 1.53 3.48 3.58 3.70 4.04 29.2% 13.5% 8.2 0.62 .340 17.4% 55.4% 33.1% 63.9% 13.0% 35.2% 0.68 4.98
2024 ATL 56 0 55.1 4-3 0 2 3.58 1.43 2.56 2.22 2.40 2.97 28.3% 7.4% 9.9 0.33 .388 13.3% 72.9% 35.5% 63.0% 11.5% 32.3% 0.61 5.18
2025 ATL 42 2 54.1 3-2 0 2 3.81 1.25 4.26 3.52 3.93 3.22 21.6% 7.6% 8.4 0.50 .314 12.0% 69.5% 42.3% 61.3% 9.9% 31.0% 0.57 5.02
2026 KC/ATL 20 0 16.1 1-1 0 4 8.82 1.96 7.05 9.19 6.39 4.07 15.5% 11.9% 12.1 3.86 .288 36.8% 64.7% 40.0% 44.1% 9.7% 26.3% 0.41 4.92
RP MLB Percentile 26 0 8 23-55 0 50 5 6 1 0 7 19 18 18 13 0 70 1 29 19 70 28 34 24 28
RP MLB AVG 30 2 38.0 2-2 2 5 4.29 1.35 4.28 4.29 4.33 3.52 22.4% 9.9% 8.3 1.15 .290 18.1% 72.4% 37.0% 43.7% 12.1% 28.4% 0.50 4.93
Career 407 2 398.0 22-21 5 86 4.00 1.34 3.44 3.47 3.36 2.35 25.6% 10.2% 8.1 0.68 .316 24.5% 69.5% 25.3% 64.8% 11.7% 31.4% 0.57 5.01

Aaron Bummer Repertoire

2018 2019 2020 2021 2022 2023 2024 2025 2026 All
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Aaron Bummer Game Log

Aaron Bummer Standard

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Year Team G GS IP W-L QS Sv Hld P Strikes Balls TBF H 1B 2B 3B HR K BB HB WP
2017 CHW 30 0 22.0 1-3 0 0 - 378 212 166 91 13 7 2 0 4 17 15 1 1
2018 CHW 37 0 31.2 0-1 0 0 2 609 367 242 144 40 33 5 1 1 35 10 1 7
2019 CHW 58 0 67.2 0-0 0 1 27 1,039 658 381 263 43 35 4 0 4 60 25 3 4
2020 CHW 9 0 9.1 1-0 0 0 3 155 97 58 38 5 5 0 0 0 14 5 0 0
2021 CHW 62 0 56.1 5-5 0 2 21 962 595 367 242 42 38 1 0 3 75 29 4 5
2022 CHW 32 0 26.2 2-1 0 2 10 457 272 185 117 30 25 3 0 2 30 10 2 0
2023 CHW 61 0 58.1 5-5 0 0 15 1,099 684 415 267 53 36 13 0 4 78 36 5 6
2024 ATL 56 0 55.1 4-3 0 0 2 974 622 352 244 61 47 11 1 2 69 18 2 2
2025 ATL 42 2 54.1 3-2 0 0 2 932 599 333 236 51 34 12 2 3 51 18 11 1
2026 KC/ATL 20 0 16.1 1-1 0 0 4 308 196 112 84 22 10 5 0 7 13 10 1 0
RP MLB Percentile 26 0 8 23-55 0 0 50 11 11 87 13 82 90 72 41 21 8 71 52 68
RP MLB AVG 30 2 38.0 2-2 0 2 5 639 407 231 164 35 23 6 1 5 37 15 2 1
Career 407 2 398.0 22-21 0 5 86 6,913 4,302 2,611 1,726 360 270 56 4 30 442 176 30 26

Aaron Bummer Advanced

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team K% BB% AVG SLG OPS wOBA BABIP BACON xAVG xwOBA xBABIP xwoBACON EV FB EV LA xERA
2017 CHW 18.7% 16.5% .178 .370 .692 .303 .170 .228 - - - - - - - -
2018 CHW 24.3% 6.9% .301 .376 .730 .323 .402 .408 - - - - - - - -
2019 CHW 22.8% 9.5% .184 .252 .523 .235 .229 .247 - - - - - - - -
2020 CHW 36.8% 13.2% .152 .152 .415 .208 .263 .263 .124 .198 .200 .212 94.2 95.1 -8.7 1.75
2021 CHW 31.0% 12.0% .202 .250 .560 .258 .298 .313 .187 .246 .283 .284 88.2 91.9 -10.9 2.63
2022 CHW 25.6% 8.5% .288 .375 .734 .328 .384 .400 .255 .299 .344 .357 89.4 83.5 -4.0 3.60
2023 CHW 29.2% 13.5% .236 .347 .699 .313 .340 .358 .201 .280 .289 .321 88.6 90.6 -2.2 3.48
2024 ATL 28.3% 7.4% .277 .364 .697 .305 .388 .396 .212 .246 .297 .302 84.7 78.9 -1.3 2.56
2025 ATL 21.6% 7.6% .250 .373 .712 .310 .314 .327 .266 .319 .335 .362 89.1 88.9 2.2 4.26
2026 KC/ATL 15.5% 11.9% .310 .676 1.074 .448 .288 .373 .274 .420 .234 .453 91.1 92.4 14.2 7.05
RP MLB Percentile 18 18 18 1 2 3 70 30 13 1 80 4 1 1 44 1
RP MLB AVG 22.4% 9.9% .242 .394 .719 .317 .290 .321 .238 .319 .281 .361 87.8 89.3 13.2 4.28
Career 25.6% 10.2% .239 .342 .671 .301 .316 .335 .203 .277 .299 .334 88.2 88.6 -1.6 3.44

Aaron Bummer Pitch › Mix

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team FF% (MPH) SI% (MPH) FC% (MPH) SL% (MPH) ST% (MPH) CB% (MPH) CH% (MPH) FS% (MPH) KN% (MPH) Fastball% Secondary%
2018 CHW6.7% (92.8)23.8% (92.9)2.6% (89.3)10.2% (83.1)--1.8% (87.5)-- 30.5% 14.6%
2019 CHW2.1% (94.9)14.2% (95.6)5.1% (87.6)0.2% (86.0)--0.1% (90.0)-- 16.3% 5.4%
2020 CHW1.3% (93.6)83.9% (95.7)9.7% (87.5)4.5% (83.8)----- 85.2% 14.2%
2021 CHW-61.5% (95.4)8.2% (88.1)29.3% (83.0)----- 61.5% 37.5%
2022 CHW-64.1% (94.5)7.7% (86.3)27.6% (82.0)--0.7% (89.0)-- 64.1% 35.9%
2023 CHW5.6% (94.7)45.3% (94.3)10.6% (87.2)-38.0% (82.5)-0.6% (88.1)-- 50.9% 49.1%
2024 ATL10.0% (93.6)39.8% (93.1)5.0% (87.4)-41.8% (82.3)2.3% (82.2)1.1% (84.2)-- 49.8% 50.2%
2025 ATL12.6% (91.6)34.8% (90.8)--18.1% (81.2)34.6% (81.0)--- 47.3% 52.7%
2026 KC/ATL8.1% (90.5)39.3% (90.3)10.7% (87.4)-19.5% (80.6)22.1% (80.2)--- 47.4% 52.3%
RP MLB Percentile 1 (3) 80 (10) 24 (23) - 51 (22) 73 (39) - - - 44.3% 54.8%
RP MLB AVG 37.7% (94.7) 26.0% (93.9) 20.4% (89.4) 25.6% (85.6) 21.2% (82.5) 16.1% (79.9) 17.3% (86.2) 18.2% (86.4) 32.3% (68.3) 48.3% 51.5%
Career5.6% (92.9)40.4% (93.8)6.1% (87.5)7.3% (82.8)16.1% (82.1)6.3% (80.9)0.5% (86.7)-- 46.0% 36.3%

Aaron Bummer Pitch › Results

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Year Team FF CSW% SI CSW% FC CSW% SL CSW% ST CSW% CB CSW% CH CSW% FS CSW% KN CSW% Fastball CSW% Secondary CSW%
2018 CHW26.8% (1)29.0% (13)25.0% (1)32.3% (12)--27.3% (2)-- 28.5% 30.3%
2019 CHW22.7% (2)25.9% (11)18.9% (9)50.0% (0)--0.0% (0)-- 25.4% 19.6%
2020 CHW0.0% (0)36.2% (10)46.7% (7)57.1% (4)----- 35.6% 50.0%
2021 CHW-30.4% (41)36.7% (19)37.9% (71)----- 30.4% 37.7%
2022 CHW-31.1% (24)31.4% (6)34.9% (19)--0.0% (0)-- 31.1% 33.5%
2023 CHW42.6% (6)32.1% (31)31.9% (22)-38.5% (82)-50.0% (2)-- 33.3% 37.2%
2024 ATL33.0% (12)34.3% (18)22.4% (4)-33.2% (76)13.6% (1)9.1% (1)-- 34.0% 30.7%
2025 ATL31.6% (11)34.6% (12)--23.7% (17)31.1% (52)--- 33.8% 28.5%
2026 KC/ATL16.0% (1)28.1% (6)30.3% (4)-26.7% (13)23.5% (6)--- 26.0% 26.1%
RP MLB Percentile 3 (0) 52 (44) 69 (60) - 42 (40) 32 (43) - - - 41.5% 32.1%
RP MLB AVG 27.0% (23) 27.3% (9) 26.6% (11) 29.2% (19) 27.8% (15) 27.3% (10) 21.9% (14) 23.3% (16) 22.0% (8) 27.8% 28.7%
Career31.5% (33)31.7% (166)30.1% (72)36.7% (106)33.4% (188)28.9% (59)21.9% (5)-- 31.7% 32.6%

Aaron Bummer Batted Ball › Contact

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Year Team GB% LD% FB% PU% SS% Pull% Cent% Oppo% Foul Str% PC% Fl&B% Solid% Brl% ICR%
2018 CHW - - - - - - - - 16.4% - - - - -
2019 CHW - - - - - - - - 19.0% - - - - -
2020 CHW 73.7% 5.3% 15.8% 5.3% 21.1% 31.6% 47.4% 21.1% 12.9% 78.9% 10.5% 5.3% 5.3% 21.1%
2021 CHW 78.5% 10.0% 9.2% 2.3% 14.6% 27.6% 43.3% 29.1% 14.9% 71.5% 24.6% 1.5% 2.3% 27.6%
2022 CHW 67.6% 20.3% 12.2% 0.0% 31.1% 37.3% 30.7% 32.0% 11.2% 69.0% 23.0% 2.7% 5.4% 30.7%
2023 CHW 63.9% 17.7% 15.6% 2.7% 28.6% 31.8% 32.4% 35.8% 13.6% 66.7% 25.9% 4.8% 2.7% 33.1%
2024 ATL 63.0% 22.1% 9.7% 5.2% 29.9% 37.4% 34.2% 28.4% 15.6% 64.2% 30.5% 3.9% 1.3% 35.5%
2025 ATL 61.3% 21.9% 16.1% 0.6% 34.8% 46.2% 26.9% 26.9% 16.5% 57.4% 33.5% 5.8% 3.2% 42.3%
2026 KC/ATL 44.1% 15.3% 32.2% 8.5% 35.6% 44.1% 33.9% 22.0% 17.9% 59.3% 20.3% 5.1% 15.3% 40.0%
RP MLB Percentile 70 89 68 51 60 32 70 51 28 18 74 76 1 19
RP MLB AVG 43.7% 21.7% 24.4% 10.2% 34.8% 40.9% 34.0% 25.0% 18.0% 62.7% 24.5% 5.8% 7.1% 37.0%
Career 64.8% 17.9% 14.4% 3.0% 28.3% 36.7% 33.9% 29.4% 15.6% 65.0% 27.1% 4.1% 3.8% 25.3%

Aaron Bummer Batted Ball › Outcomes

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team AVG wOBA BABIP BACON xAVG xwOBA xBABIP xwoBACON EV FB EV LA HR/FB ICR% IPA%
2018 CHW .301 .323 .402 .408 - - - - - - - - - -
2019 CHW .184 .235 .229 .247 - - - - - - - - - -
2020 CHW .152 .208 .263 .263 .124 .198 .200 .212 94.2 95.1 -8.7 0.0% 21.1% 10.5%
2021 CHW .202 .258 .298 .313 .187 .246 .283 .284 88.2 91.9 -10.9 25.0% 27.6% 15.3%
2022 CHW .288 .328 .384 .400 .255 .299 .344 .357 89.4 83.5 -4.0 22.2% 30.7% 19.7%
2023 CHW .236 .313 .340 .358 .201 .280 .289 .321 88.6 90.6 -2.2 17.4% 33.1% 18.4%
2024 ATL .277 .305 .388 .396 .212 .246 .297 .302 84.7 78.9 -1.3 13.3% 35.5% 22.5%
2025 ATL .250 .310 .314 .327 .266 .319 .335 .362 89.1 88.9 2.2 12.0% 42.3% 28.0%
2026 KC/ATL .310 .448 .288 .373 .274 .420 .234 .453 91.1 92.4 14.2 36.8% 40.0% 28.6%
RP MLB Percentile 18 3 70 30 13 1 80 4 1 1 44 1 19 18
RP MLB AVG .242 .317 .290 .321 .238 .319 .281 .361 87.8 89.3 13.2 18.1% 37.0% 24.6%
Career .239 .301 .316 .335 .203 .277 .299 .334 88.2 88.6 -1.6 24.5% 25.3% 15.8%

Aaron Bummer Approach › Plate Discipline

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team Zone% Str% Swing% O-Sw% Whiff% Foul Str% Con% Z-Con% O-Con% CS% SwStr% CSW% BIP% PLUS% IPR% Str-ICR
2018 CHW - 60.3% 43.5% - 25.3% 16.4% 74.7% - - 16.7% 11.0% 27.8% 16.1% 53.7% 0.44 -
2019 CHW - 63.3% 47.3% - 24.2% 19.0% 75.8% - - 16.1% 11.5% 27.5% 16.8% 59.2% 0.48 -
2020 CHW 40.0% 62.6% 38.7% 29.0% 35.0% 12.9% 65.0% 81.8% 44.4% 23.9% 13.5% 37.4% 12.3% 59.4% 0.76 57.4%
2021 CHW 44.3% 61.9% 42.4% 27.6% 32.1% 14.9% 67.9% 85.3% 37.2% 19.4% 13.6% 33.1% 13.9% 57.5% 0.62 54.2%
2022 CHW 45.7% 59.5% 38.3% 24.2% 28.0% 11.2% 72.0% 83.5% 50.0% 21.2% 10.7% 31.9% 16.4% 53.0% 0.50 49.5%
2023 CHW 44.4% 62.2% 40.0% 29.8% 32.5% 13.6% 67.5% 82.2% 46.7% 22.2% 13.0% 35.2% 13.5% 57.4% 0.68 53.3%
2024 ATL 46.0% 63.9% 43.0% 29.8% 26.7% 15.6% 73.3% 80.5% 61.1% 20.8% 11.5% 32.3% 15.9% 57.6% 0.61 52.6%
2025 ATL 45.1% 64.3% 43.1% 31.6% 22.9% 16.5% 77.1% 89.2% 59.3% 21.1% 9.9% 31.0% 16.7% 58.8% 0.57 50.1%
2026 KC/ATL 50.3% 63.6% 47.1% 26.8% 20.7% 17.9% 79.3% 89.4% 53.7% 16.6% 9.7% 26.3% 19.5% 56.5% 0.41 48.1%
RP MLB Percentile 91 33 32 12 32 28 32 18 85 54 28 34 72 23 24 12
RP MLB AVG 44.5% 63.6% 47.3% 31.4% 25.6% 18.0% 74.4% 83.8% 58.7% 16.3% 12.1% 28.4% 17.1% 58.1% 0.50 50.9%
Career 33.8% 62.2% 42.9% 29.0% 27.2% 15.6% 72.8% 84.5% 51.0% 19.7% 11.7% 31.4% 15.6% 57.3% 0.57 54.7%

Aaron Bummer Approach › Locations

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team Zone% aLoc% x-mLoc% gLoc% hiLoc% y-mLoc% loLoc% iLoc% oLoc% mmLoc%
2018 CHW - - - - - - - - - -
2019 CHW - - - - - - - - - -
2020 CHW 40.0% 14.9% 22.7% 62.3% 6.5% 21.4% 72.1% 43.5% 33.8% 6.5%
2021 CHW 44.3% 28.0% 25.5% 46.5% 12.1% 26.2% 61.7% 35.8% 38.7% 7.6%
2022 CHW 45.7% 34.4% 23.6% 42.0% 18.4% 26.9% 54.7% 35.0% 41.4% 6.6%
2023 CHW 44.4% 34.8% 23.7% 41.6% 14.8% 23.4% 61.8% 33.4% 42.9% 5.8%
2024 ATL 46.0% 35.6% 25.7% 38.7% 11.8% 23.0% 65.2% 35.0% 39.3% 6.2%
2025 ATL 45.1% 29.0% 23.5% 47.5% 17.1% 23.3% 59.7% 36.7% 39.8% 5.8%
2026 KC/ATL 50.3% 21.5% 27.7% 50.8% 21.2% 29.6% 49.2% 28.7% 43.6% 9.8%
RP MLB Percentile 91 1 36 96 2 4 89 34 53 97
RP MLB AVG 44.5% 34.7% 26.9% 38.4% 36.3% 22.9% 40.8% 29.9% 43.2% 6.6%
Career 33.8% 31.0% 24.6% 44.4% 14.6% 24.5% 60.9% 35.0% 40.4% 6.6%

Aaron Bummer Approach › Counts

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team Early% Behind% 2-Str% Early BIP% F-Str% TF-Str% ECS% 2-Str O-Sw% PAR%
2018 CHW 56.5% 16.3% 27.4% 11.9% 53.5% 45.8% 20.6% - 21.0%
2019 CHW 58.9% 11.5% 29.7% 13.1% 59.6% 49.6% 21.1% - 19.4%
2020 CHW 58.7% 15.5% 25.8% 9.9% 56.4% 51.3% 29.7% 37.5% 35.0%
2021 CHW 58.4% 12.1% 30.7% 12.6% 59.9% 50.0% 26.3% 26.4% 25.4%
2022 CHW 61.7% 15.8% 22.5% 13.1% 52.5% 44.1% 22.7% 25.2% 29.1%
2023 CHW 59.1% 12.7% 29.5% 10.5% 61.1% 55.8% 27.7% 30.2% 24.1%
2024 ATL 57.9% 13.2% 29.8% 12.1% 57.4% 47.5% 25.7% 27.6% 23.8%
2025 ATL 59.7% 11.2% 30.7% 12.6% 56.5% 50.0% 27.9% 26.9% 17.8%
2026 KC/ATL 62.3% 12.0% 25.6% 19.3% 64.3% 52.4% 20.3% 26.6% 16.5%
RP MLB Percentile 91 45 7 95 70 61 34 48 38
RP MLB AVG 58.6% 12.3% 29.7% 14.5% 60.7% 50.0% 21.1% 26.5% 19.2%
Career 59.0% 12.9% 29.0% 12.5% 58.2% 49.9% 24.9% 20.9% 22.5%

Aaron Bummer PLV

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team P PLV QP% AP% BP% Q-BP% MTK% HP HL PLA
2018 CHW 609 - - - - - - - - 0.00
2019 CHW 1,039 - - - - - - - - 0.00
2020 CHW 155 4.64 38.7% 16.1% 45.2% -6.5% 3.9% -4.9 -1 4.73
2021 CHW 962 5.02 48.0% 17.3% 34.7% 13.2% 4.5% -5.3 -6 3.57
2022 CHW 457 4.89 42.7% 17.3% 40.0% 2.6% 3.9% 7.1 +11 3.79
2023 CHW 1,099 4.98 47.3% 17.1% 35.6% 11.7% 5.2% 5.6 -3 4.04
2024 ATL 974 5.18 46.7% 19.2% 34.1% 12.6% 5.9% 10.0 +10 2.97
2025 ATL 932 5.02 48.0% 16.5% 35.5% 12.4% 4.2% 17.7 +17 3.22
2026 KC/ATL 308 4.92 47.7% 14.0% 38.3% 9.4% 4.5% 10.9 +4 4.07
RP MLB Percentile 11 28 57 10 25 25 56 16 38 19
RP MLB AVG 639 4.93 45.8% 17.4% 36.8% 9.0% 4.7% 0.8 0 3.52
Career 6,913 5.01 46.8% 17.2% 36.0% 10.8% 4.8% 41.0 +32 2.35
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