Players · S · Pitcher · 2026 regular season

Carson Seymour

San Francisco Giants National League West

Age: 28
B/T: R/R
Height: 6' 5"
Weight: 264 lb
Number: #77

Born: December 16, 1998 in Poway, CA, United States
MLB debut: June 29, 2025
Drafted: 2021, round 6
College: Kansas State

Compare with…vs Joel Kuhnel vs Kyle Finnegan vs Jimmy Herget

dbWAR: -.9
IP: 31.2
ERA: 4.55
FIP: 5.72
K/9: 6.5
FIP−: 137

Carson Seymour is a relief pitcher for the San Francisco Giants. In 2026 he struck out 23 batters over 31.2 innings across 25 appearances, going 0-2. His ERA of 4.55 was 8.8% higher than the league average of 4.18 — 19th of 25 on his team, and 350th of 539 among MLB pitchers with 20+ innings. Stripping out defence, his 5.72 FIP suggests that his ERA had some help behind him. He missed bats on 23.8% of swings (11.1% of every pitch he threw), walked 11.4% of the batters he faced and struck out 16.4%. His -0.4 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 regular season.

FIP5.72

K/96.5

WHIP1.48

WAR-.4

WAR by season

Pitching Regular season

Standard and advanced, by season. Regular-season games only.

																				Trend
2026	SF	25	1	31.2	0	2	1	31	16	23	16	4.55	5.72	1.48	6.5	4.5	109	137	-0.4
2025	SF	16	3	36.0	1	3	0	37	19	26	13	4.75	6.11	1.39	6.5	3.3	114	147	-0.6

Platoon splits

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

Season

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	75	64	19	3	9	12	.297	.392	.484	.383	16.0%
vs RHB	65	57	12	3	7	11	.211	.297	.421	.310	16.9%

Pitch sequencing

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

ShowBatter

SinkerSliderCutterFour-seamSplitter

Select a count to see exactly what Carson Seymour throws in it.

Pitch arsenal

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

Season


Sinker	33.6%	178	96.6	2,255	47.8%	19.2%	39	.256	.854
Slider	24.2%	128	88.6	2,078	38.3%	35.9%	36	.167	.564
Cutter	22.5%	119	94.3	2,440	38.7%	25.5%	25	.360	.928
Four-Seam Fastball	16.8%	89	97.2	2,231	46.1%	16.0%	19	.211	.664
Splitter	2.8%	15	91.7	1,303	26.7%	0.0%	3	—	—

Carson Seymour'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.

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Similar players

Nearest 2026 seasons by command, run prevention and role, on rate statistics rather than totals.

Kyle FinneganDET

ERA: 4.30
FIP: 5.43
SO: 47
WAR: -0.5

Jimmy HergetCOL

ERA: 5.70
FIP: 5.40
SO: 47
WAR: -0.3

Joel KuhnelATH

ERA: 4.40
FIP: 5.35
SO: 28
WAR: -0.2

Dennis SantanaPIT

ERA: 5.56
FIP: 5.15
SO: 49
WAR: -0.2

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.