Players · S · Pitcher · 2025

Spencer Schwellenbach

Age: 25
B/T: R/R
Height: 6' 1"
Weight: 200 lb
Number: #56

Born: May 31, 2000 in Saginaw, MI, United States
MLB debut: May 29, 2024
Drafted: 2018, round 34
College: Nebraska
High school: Saginaw Heritage

dbWAR: 5.1
IP: 110.2
ERA: 3.09
FIP: 3.25
K/9: 8.8
FIP−: 78

Spencer Schwellenbach was a starting pitcher for the Atlanta Braves. In 2025 he struck out 108 batters over 110.2 innings across 17 appearances, 17 of them starts, going 7-4. His ERA of 3.09 was 25.7% lower than the league average of 4.16 — 4th of 17 on his team, and 138th of 542 among MLB pitchers with 20+ innings. Stripping out defence, his 3.25 FIP suggests the ERA was no fluke. He missed bats on 28.3% of swings (14.7% of every pitch he threw), walked 4.1% of the batters he faced and struck out 24.9%. His 2.5 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, 2025.

FIP3.25

K/98.8

WHIP0.97

WAR2.5

WAR by season

Pitching

Standard and advanced, by season.

																				Trend
2025	ATL	17	17	110.2	7	4	0	89	38	108	18	3.09	3.25	0.97	8.8	1.5	74	78	2.5
2024	ATL	21	21	123.2	8	7	0	106	46	127	23	3.35	3.29	1.04	9.2	1.7	82	81	2.6

Platoon splits

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

Season

Opponent batting by the side the hitter bats from, 2025. 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	236	218	49	11	14	46	.225	.272	.413	.294	19.5%
vs RHB	198	192	40	2	4	62	.208	.227	.313	.234	31.3%

Pitch sequencing

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

ShowBatter

Four-seamSliderSplitterCurveballCutterSinker

Select a count to see exactly what Spencer Schwellenbach throws in it.

Pitch arsenal

What he throws, how hard, how often it misses, and what hitters do with it.

Season


Four-Seam Fastball	35.3%	555	97.1	2,318	56.2%	27.1%	138	.217	.584
Slider	18.1%	285	87.0	2,349	42.5%	34.4%	91	.253	.732
Splitter	13.9%	218	84.7	1,368	41.7%	42.0%	68	.132	.369
Curveball	11.4%	180	81.0	2,301	50.6%	31.1%	33	.242	.697
Cutter	11.3%	177	94.1	2,301	50.8%	17.7%	33	.242	.718
Sinker	10.0%	158	95.6	2,179	44.3%	11.1%	48	.229	.698

Spencer Schwellenbach'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. BAA and OPS are what hitters did against each pitch, credited to the one that ended the plate appearance, and are left blank under 15 at-bats.

Head to head

Put Spencer Schwellenbach beside up to three others.

Compare — add up to 3 more players

Spencer Schwellenbach

Or read one already written — Spencer Schwellenbach against:

Similar players

Nearest 2025 seasons by command, run prevention and role, on rate statistics rather than totals.

Bryan WooSEA

ERA: 2.94
FIP: 3.47
SO: 198
WAR: 3.5

Very close

Nick LodoloCIN

ERA: 3.33
FIP: 3.81
SO: 156
WAR: 2.5

Very close

Jacob deGromTEX

ERA: 2.97
FIP: 3.64
SO: 185
WAR: 2.9

Kevin GausmanTOR

ERA: 3.59
FIP: 3.41
SO: 189
WAR: 4.0

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.