Players · G · Pitcher · 2025

Sean Guenther

Age: 30
B/T: L/L
Height: 5' 11"
Weight: 194 lb
Number: #73

Born: December 29, 1995 in Atlanta, GA, United States
MLB debut: August 4, 2021
Drafted: 2017, round 7
College: Notre Dame
High school: Marist School

dbWAR: .9
IP: 10.1
ERA: 5.23
FIP: 3.04
K/9: 7.0
FIP−: 73

Sean Guenther was a relief pitcher for the Detroit Tigers. In 2025 he struck out 8 batters over 10.1 innings across 9 appearances, going 0-1. His ERA of 5.23 was 25.7% higher than the league average of 4.16. Stripping out defence, his 3.04 FIP suggests he pitched better than his ERA shows. He missed bats on 18.8% of swings (7.8% of every pitch he threw), walked 11.6% of the batters he faced and struck out 18.6%. His 0.2 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.

FIP3.04

K/97.0

WHIP1.45

WAR.2

WAR by season

Pitching

Standard and advanced, by season.


2025	DET	9	1	10.1	0	1	10	6	8	5	5.23	3.04	1.45	7.0	4.4	126	73	0.2
2024	DET	17	0	21.0	3	0	9	2	12	2	0.86	2.60	0.52	5.1	0.9	21	64	0.5
2021	MIA	14	0	20.1	0	1	31	21	15	10	9.30	4.10	2.02	6.6	4.4	218	96	0.2

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	21	19	7	0	2	4	.368	.429	.474	.399	19.0%
vs RHB	22	19	3	0	3	4	.158	.273	.158	.219	18.2%

Pitch sequencing

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

ShowBatter

SinkerSliderSplitter

Select a count to see exactly what Sean Guenther throws in it.

Pitch arsenal

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

Season


Sinker	40.9%	63	89.9	2,035	50.8%	12.5%	13	—	—
Slider	34.4%	53	78.7	2,299	43.4%	13.0%	16	.250	.607
Splitter	22.1%	34	83.1	1,359	35.3%	35.3%	9	—	—

Sean Guenther'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

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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.