Players · K · Pitcher · 2026 regular season

George Kirby

Age: 28
B/T: R/R
Height: 6' 4"
Weight: 215 lb
Number: #68

Born: February 4, 1998 in Rye, NY, United States
MLB debut: May 8, 2022
Drafted: 2019, round 1
College: Elon
High school: Rye
Salary, 2026: $6.55M

Compare with…vs Bryan Woo vs Ryan Gusto vs Logan Gilbert

dbWAR: 16.3
IP: 174.2
ERA: 4.33
FIP: 3.90
K/9: 7.6
FIP−: 93

George Kirby is a starting pitcher for the Seattle Mariners. In 2026 he struck out 148 batters over 174.2 innings across 30 appearances, 30 of them starts, going 9-11. His ERA of 4.33 was 3.5% higher than the league average of 4.18 — 12th of 16 on his team, and 318th of 539 among MLB pitchers with 20+ innings. Stripping out defence, his 3.90 FIP suggests he pitched better than his ERA shows. He missed bats on 22.4% of swings (11.6% of every pitch he threw), walked 6.3% of the batters he faced and struck out 20.0%. 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, 2026 regular season.

FIP3.90

K/97.6

WHIP1.40

WAR2.5

WAR by season

Pitching Regular season

Standard and advanced, by season. Regular-season games only — postseason games are listed separately below.


2026	SEA	30	30	174.2	9	11	197	84	148	47	4.33	3.90	1.40	7.6	2.4	104	93	2.5
2025	SEA	23	23	126.0	10	8	121	59	137	29	4.21	3.37	1.19	9.8	2.1	101	81	2.5
2024	SEA	33	33	191.0	14	11	181	75	179	23	3.53	3.26	1.07	8.4	1.1	87	80	3.9
2023	SEA	31	31	190.2	13	10	179	71	172	19	3.35	3.34	1.04	8.1	0.9	77	77	4.3
2022	SEA	25	25	130.0	8	5	135	49	133	22	3.39	2.99	1.21	9.2	1.5	85	75	3.0

Separate from the regular season

Postseason Postseason

Wild Card through World Series. These games are counted on their own: none of them are in the regular-season tables, career totals, league context, leaderboards or dbWAR on this page.

Postseason pitching

Postseason George Kirby's postseason pitching, by October and round. Not part of any regular-season figure on this page.
Season	Team	Round	G	GS	IP	L	SV	H	ER	HR	BB	SO	ERA	WHIP	K/9
2025 Post	SEA	Postseason total	4	4	18.0	1	0	21	12	4	4	21	6.00	1.39	10.5
		ALDS	2	2	10.0	0	0	9	3	1	1	14	2.70	1.00	12.6
		ALCS	2	2	8.0	1	0	12	9	3	3	7	10.13	1.88	7.9
2022 Post	SEA	Postseason total	2	1	8.0	0	1	6	0	0	1	6	0.00	0.88	6.8
		Wild Card	1	0	1.0	0	1	0	0	0	1	1	0.00	1.00	9.0
		ALDS	1	1	7.0	0	0	6	0	0	0	5	0.00	0.86	6.4
Career		Postseason total · 2 Octobers	6	5	26.0	1	1	27	12	4	5	27	4.15	1.23	9.3

Box-score and rate statistics only. wOBA, wRC+, FIP and dbWAR are measured against a full league season, and a postseason is a few teams playing each other for a month, so they are not computed for October.

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	387	353	100	13	32	70	.283	.344	.467	.354	18.1%
vs RHB	354	334	97	9	15	78	.290	.323	.428	.329	22.0%

Pitch sequencing

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

ShowBatter

Four-seamSweeperSinkerKnuckle curveChangeupCutterSplitter

Select a count to see exactly what George Kirby throws in it.

Pitch arsenal

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

Season


Four-Seam Fastball	28.4%	782	96.7	2,264	49.6%	23.4%	208	.250	.736
Sweeper	28.3%	781	87.5	2,377	47.8%	26.6%	196	.250	.663
Sinker	21.0%	578	96.9	2,303	48.8%	12.5%	153	.327	.809
Knuckle Curve	10.2%	281	84.1	2,372	46.6%	22.9%	58	.431	1.029
Changeup	6.1%	168	88.6	1,525	36.9%	26.3%	37	.216	.752
Cutter	4.2%	116	92.9	2,300	40.5%	30.4%	22	.273	.833
Splitter	1.9%	52	87.1	1,082	26.9%	23.1%	16	.438	1.563

George Kirby'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.

Ryan GustoMIA

ERA: 4.09
FIP: 4.17
SO: 74
WAR: 0.9

Very close

Janson JunkMIA

ERA: 4.22
FIP: 4.14
SO: 89
WAR: 1.5

Very close

Davis MartinCWS

ERA: 3.95
FIP: 3.83
SO: 122
WAR: 2.3

Very close

Casey MizeDET

ERA: 4.32
FIP: 4.15
SO: 110
WAR: 1.6

Very close

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.