Aaron

Bummer

PAge : 33Throws : L

#36

Aaron Bummer

#36P

Height : 6' 3" · Weight : 98 kg · Bats : L · Throws : L · MLB debut : 2017-07-27

Born in : Valencia, CA, USA

MLB record

Year	Team	PJ	V	D	MPM	MJ	RB	WHIP
2026		21	1	2	10.26	16.2	13	2.10
2026	Kansas City Royals	2	0	1	40.50	1.1	0	5.25
2026	Atlanta Braves	19	1	1	7.63	15.1	13	1.83
2025	Atlanta Braves	42	3	2	3.81	54.1	51	1.25
2024	Atlanta Braves	56	4	3	3.58	55.1	69	1.43
2023	Chicago White Sox	61	5	5	6.79	58.1	78	1.53
2022	Chicago White Sox	32	2	1	2.36	26.2	30	1.50
2021	Chicago White Sox	62	5	5	3.51	56.1	75	1.26
2020	Chicago White Sox	9	1	0	0.96	9.1	14	1.07
2019	Chicago White Sox	58	0	0	2.13	67.2	60	0.99
2018	Chicago White Sox	37	0	1	4.26	31.2	35	1.58
2017	Chicago White Sox	30	1	3	4.50	22.0	17	1.27
Career totals		408	22	22	4.07	398.1	442	1.35

ContractKansas City Royals payroll →

Type: Free Agent
Length: 1 yr · 2026–2026
Total value: 0.0 M$
AAV: 0.03 M$

2026
0.03 M$
Not 40 man

Advanced stats, 2026Relief pitcherMLB stats →

ERA

10.26

FIP

9.16

xFIP

6.06

ERA-

243

WHIP

2.10

14.8 %

BB%

12.5 %

Strikeouts

Innings

16.7

Wins

Stats: MLB (statsapi) and Baseball Savant.

2027 projectionMLB trends →

Projected WAR

-1.9

Strikeouts

2026 WAR

-0.9

This season's pace, over the average of the last two workloads, adjusted for next year's age.

Trend

↓ Slight decline (-17)

20230.7 WAR · 0.8 per full season
20241.1 WAR · 1.3 per full season
20250.4 WAR · 0.5 per full season
2026-0.9 WAR · -3.5 per full season

Outlook, age included

-32 · 32 y.o. · the age when performance usually declines

It is only a projection. It knows nothing about injuries, trades or role changes.

Player ratings, 2026All ratings →

Ratings from 0 to 100, computed from Statcast and MLB stats over four seasons, never by hand. 75 = established regular, 87 = 90th percentile, 95+ = elite.

OV · Overall

Established regular

VEL: Velocity; 62
STF: Stuff; 73
CTL: Control; 74
CNT: Contact allowed; 75
STA: Stamina; —
DUR: Durability; 69
EX: Experience; 81

Why these ratings?

VEL — Velocity : Fastball velocity
STF — Stuff : Strikeouts, K − BB
CTL — Control : Walks avoided
CNT — Contact allowed : xwOBA, barrels and hard-hit balls allowed
STA — Stamina : Innings per start and innings pitched
DUR — Durability : Games played over several seasons
EX — Experience : Seasons in the majors

WAR and PAL Rating, 2026How we rate →

WAR is fWAR (FanGraphs' version, distributed through MLB's API): wins added above a replacement player. PAL Rating scores performance from 0 to 100 against regulars in the same role (50 = median).

WAR

-0.9

PAL Rating

1 / 100

Value Rating

9 / 100

Surplus $-8.8M · salary $0.0M

PAL: dimensions

Run prevention0

Stuff11

Command25

Contact allowed4

Velocity14

A pitcher's WAR

Computed by MLB from FIP (strikeouts, walks, home runs). FIP: 9.16 · RA9-WAR: -1.2

StatcastStatcast leaderboards →

MLB's tracking of every ball, 2026 season. The percentile ranks the player among regulars in the role: 90th means better than 90% of them.

Fastball

90.6 mi/h

4th percentile

14.8 %

4th percentile

BB%

12.5 %

16th percentile

xERA

6.56

1th percentile

xwOBA allowed

.382

1th percentile

Barrels allowed

12.7 %

3th percentile

Season by season
Season	Team	WAR	PAL	OV	Fastball	K%	BB%	xERA	xwOBA allowed
2026	KC	-0.9	1	70	90.6	14.8	12.5	6.56	.382
2025	ATL	0.4	53	81	91.6	21.7	7.2	4.22	.318
2024	ATL	1.1	89	85	93.6	28.3	7.4	2.79	.264
2023	CWS	0.7	49	79	94.6	29.2	13.5	3.58	.293
2022	CWS	0.3	65	81	94.3	25.6	8.5	3.83	.307
2021	CWS	1.2	90	87	97.5	31.0	12.0	2.58	.249

Game log, 2026

Date	Opponent	IP	H	ER	BB	SO	ERA
Aug 6	vs MIN	0.1	2	3	1	0	10.26
Aug 2	@ COL	1.0	4	3	0	0	8.82
May 18	@ MIA	1.0	3	6	5	1	7.63
May 14	vs CHC	1.1	0	0	0	1	4.40
May 8	@ LAD	1.0	0	0	0	0	4.85
May 4	@ SEA	0.2	2	0	1	1	5.25
May 3	@ COL	1.0	3	2	0	2	5.56
Apr 30	vs DET	0.2	0	0	1	1	4.35
Apr 28	vs DET	1.0	2	2	0	0	4.66
Apr 26	vs PHI	1.0	1	0	0	1	3.12