Pitcher · 2026

Aaron Bummer

Age: 33
B/T: L/L
Height: 6' 3"
Weight: 215 lb
Number: #36

Born: September 21, 1993 in Valencia, CA, USA
MLB debut: July 27, 2017
Drafted: 2011, round 31
College: Nebraska
High school: Sunrise Mountain
Salary, 2026: $9.5M

dbWAR: 1.3
IP: 16.2
ERA: 10.26
FIP: 9.15
K/9: 7.0
FIP−: 219

Aaron Bummer is a relief pitcher for the Atlanta Braves. In 2026 he struck out 13 batters over 16.2 innings across 21 appearances, going 1-2. His ERA of 10.26 was 145.7% higher than the league average of 4.18. Stripping out defence, his 9.15 FIP suggests he pitched better than his ERA shows. He missed bats on 19.5% of swings (9.1% of every pitch he threw), walked 12.5% of the batters he faced and struck out 14.8%. His -0.8 dbWAR is built from that FIP rather than runs allowed, so it credits him for what he controls and not for the defence behind him.

League context

Percentile among qualified pitchers, 2026.

FIP9.15

K/97.0

WHIP2.10

WAR-.8

Platoon splits

How left- and right-handed hitters fare against him.

Opponent batting by the side the hitter bats from, 2026. Counted from play-by-play, so totals can differ from the box-score season line by a plate appearance or two.
Split	PA	AB	H	HR	BB	SO	AVG	OBP	SLG	wOBA	K%
vs LHB	44	37	12	3	6	7	.324	.419	.676	.462	15.9%
vs RHB	44	37	12	4	5	6	.324	.409	.676	.453	13.6%

Pitch sequencing

What Aaron Bummer throws in each count, and what he follows each pitch with. Select any cell for the breakdown.

ShowBatter

SinkerCurveballSweeperCutterFour-seam

Select a count to see exactly what Aaron Bummer throws in it.

Pitch arsenal

What he throws, how hard, and how often it misses in 2026.


Sinker	38.7%	127	90.3	1,997	48.8%	11.5%
Sweeper	21.6%	71	80.6	2,301	43.7%	33.3%
Curveball	21.3%	70	80.2	2,298	40.0%	17.1%
Cutter	10.1%	33	87.7	2,162	57.6%	20.0%
Four-Seam Fastball	8.2%	27	90.6	2,173	22.2%	12.5%

Aaron Bummer's arsenal by usage. Velocity is average release speed in mph, spin in rpm, and whiff rate is misses per swing — the cleanest single measure of whether a pitch beats hitters.

Pitching

Standard and advanced, by season.


2026	21	0	16.2	1	2	24	19	13	11	10.26	9.15	2.10	7.0	5.9	246	219	-0.8
2025	42	2	54.1	3	2	51	23	51	17	3.81	3.52	1.25	8.4	2.8	92	85	0.7
2024	56	0	55.1	4	3	61	22	69	18	3.58	2.23	1.43	11.2	2.9	88	55	1.4

Head to head

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Aaron Bummer

How these are computed

wOBA uses linear weights measured from this season's own play-by-play rather than published constants, and wRC+ is park-adjusted against that same league. dbWAR is our own open implementation — not fWAR or bWAR — and the full derivation, including its simplifications, is on the methodology page.