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Aaron Bummer

P · CWS

32 yrs

Pitcher

Description

Position: P
Team: CWS
Type: Pitcher
Bats: Left
Throws: Left
Born: 1993-09-21
Age: 32
Country: USA
Height: 6'3"
Weight: 215 lb
Last active: 2026

Career Résumé

10 seasons

Seasons	10 2017–2026
Games	406
W-L	22-21
ERA	3.94
WHIP	1.34
IP	397
SO	442
SV	5

Pitching Projections

2026 · per ~700 BF

Stat	Proj	Range (p10–p90)	vs LY
SO	175	131–200	+3
BB	59	43–77	-2
HR	15	9–26	+3
Hits	154	135–186	+1
ER	75	53–92	-3

Pitching

Regular season

Season	Tm	W	L	ERA	WHIP	G	GS	SV	IP	SO	BB	HR	ER	xERA	Brl%
2026	ATL	1	1	7.63	1.83	19	0	0	15.1	13	10	6	13	6.51	15.1%
2025	ATL	3	2	3.81	1.25	42	2	0	54.1	51	17	3	23	4.22	3.2%
2024	ATL	4	3	3.58	1.43	56	0	0	55.1	69	18	2	22	2.81	1.3%
2023	CWS	5	5	6.79	1.53	61	0	0	58.1	78	36	4	44	3.58	2.7%
2022	CWS	2	1	2.36	1.50	32	0	2	26.2	30	10	2	7	3.83	6.7%
2021	CWS	5	5	3.51	1.26	62	0	2	56.1	75	29	3	22	2.62	2.2%
2020	CWS	1	0	0.96	1.07	9	0	0	9.1	14	5	0	1	2.88	5.3%
2019	CWS	0	0	2.13	0.99	58	0	1	67.2	60	24	4	16	2.62	2.3%
2018	CWS	0	1	4.26	1.58	37	0	0	31.2	35	10	1	15	4.01	7.1%
2017	CWS	1	3	4.50	1.27	30	0	0	22.0	17	15	4	11	4.70	6.9%

Fielding

Regular season · OAA 2016+

Season	Pos	G	GS	Inn	PO	A	E	DP	FLD%	RF/9	OAA
2026	P	19	0	15.1	0	3	0	0	1.000	1.76	—
2025	P	42	2	54.1	3	8	2	0	.846	1.82	—
2024	P	56	0	55.1	1	10	1	0	.917	1.79	—
2023	P	61	0	58.1	7	7	1	0	.933	2.16	—
2022	P	32	0	26.2	0	2	0	0	1.000	0.68	—
2021	P	62	0	56.1	2	9	1	2	.917	1.76	—
2020	P	9	0	9.1	0	0	1	0	.000	0.00	—
2019	P	58	0	67.2	4	12	1	1	.941	2.13	—
2018	P	37	0	31.2	1	2	0	1	1.000	0.85	—
2017	P	30	0	22.0	1	6	1	1	.875	2.86	—

Pitching game log

2026 · last 19

Date		Opp	Res	Dec	IP	H	R	ER	HR	BB	SO	Pit
2026-05-18	@	MIA	L	ND	1.0	3	6	6	2	5	1	42
2026-05-14	vs	CHC	L	ND	1.1	0	0	0	0	0	1	14
2026-05-08	@	LAD	L	ND	1.0	0	0	0	0	0	0	9
2026-05-04	@	SEA	L	ND	0.2	2	0	0	0	1	1	14
2026-05-03	@	COL	W	W	1.0	3	2	2	1	0	2	16
2026-04-30	vs	DET	L	ND	0.2	0	0	0	0	1	1	12
2026-04-28	vs	DET	W	ND	1.0	2	2	2	1	0	0	12
2026-04-26	vs	PHI	W	ND	1.0	1	2	0	1	0	1	25
2026-04-24	vs	PHI	W	H	1.0	1	0	0	0	0	0	22
2026-04-21	@	WSH	L	ND	1.0	0	0	0	0	0	1	10
2026-04-20	@	WSH	W	H	0.1	0	0	0	0	0	0	3
2026-04-19	@	PHI	W	ND	0.1	1	0	0	0	0	0	5
2026-04-13	vs	MIA	L	L	1.0	4	3	3	1	0	2	22
2026-04-11	vs	CLE	L	ND	0.2	0	0	0	0	2	0	22
2026-04-10	vs	CLE	W	ND	0.1	0	0	0	0	0	0	6
2026-04-07	@	LAA	W	H	0.1	0	0	0	0	1	0	17
2026-04-06	@	LAA	L	ND	1.0	0	0	0	0	0	1	7
2026-03-30	vs	ATH	W	H	1.0	1	0	0	0	0	2	13
2026-03-28	vs	KC	W	ND	0.2	0	0	0	0	0	0	12

Pitching Profile2025 · vs 402

K/9

8.446

BB/9

2.862

HR/9

0.592

ERA

3.8150

WHIP

1.2550

xERA

4.2238

Brl%A

3.2%99

PlayerMedian (50th)percentile vs league

Career Highs

Stat	Best	Year
Wins	5	2023
SO	78	2023
SV	2	2022
ERA	0.96	2020
WHIP	0.99	2019

Comparable Players

2025 · stat-profile similarity

Ryan WalkerSF30y
4.11 ERA · 60 K · 1.27 WHIP
95%
vs
Kyle LeahySTL29y
3.07 ERA · 80 K · 1.23 WHIP
92%
vs
Hoby MilnerTEX35y
3.84 ERA · 58 K · 1.27 WHIP
92%
vs
Emmanuel ClaseCLE28y
3.23 ERA · 47 K · 1.23 WHIP
90%
vs
Kyle FinneganDET34y
3.47 ERA · 55 K · 1.11 WHIP
90%
vs

Career Arc

ERA by season · taller = better

Year over Year

pitching trajectory

Yr	Tm	W	ERA	WHIP	SO	IP
21	CWS	5	3.51	1.26	75	56
22	CWS	2▼	2.36▼	1.50▲	30▼	27▼
23	CWS	5▲	6.79▲	1.53▲	78▲	58▲
24	ATL	4▼	3.58▼	1.43▼	69▼	55▼
25	ATL	3▼	3.81▲	1.25▼	51▼	54▼
26	ATL	1▼	7.63▲	1.83▲	13▼	15▼

Career Milestones

chase to the next mark

Wins22

28 to 50

Strikeouts442

558 to 1,000

Saves5

95 to 100

Season

Pitch Arsenal

2025 · Statcast

Pitch	Use	Velo	Spin
Curve	35%	81.0	2368
Sinker	35%	90.8	2147
Sweeper	18%	81.2	2436
4-Seam	12%	91.6	2282

Plate Discipline

2025 · induced

29.4%

Chase

lg 28.5%

58.2%

Z-Swing

lg 67%

21.2%

Whiff

lg 24.5%

78.8%

Contact

lg 76%

45.7%

Zone

lg 48.5%

30.0%

CSW

lg 28%

974 pitches · green/red vs league avg

Statcast Trend

xERA by season · taller = better

Barrel% Against by season · taller = better

Per game	1.1
Ceiling (90th)	4.6
Floor (10th)	-2.3
Std dev	3.9
Boom rate	42%
Bust rate	32%
Profile	Volatile