Players · C · Pitcher · 2026

Cooper Criswell

Age: 30
B/T: R/R
Height: 6' 6"
Weight: 200 lb
Number: #88

Born: July 24, 1996 in Carrollton, GA, United States
MLB debut: August 27, 2021
Drafted: 2018, round 13
College: North Carolina

dbWAR: 1.3
IP: 39.2
ERA: 3.40
FIP: 3.73
K/9: 7.0
FIP−: 89

Cooper Criswell is a relief pitcher for the Seattle Mariners. In 2026 he struck out 31 batters over 39.2 innings across 36 appearances, going 4-2. His ERA of 3.40 is 18.5% lower than the league average of 4.18 — the second best on his team, and 152nd of 538 among MLB pitchers with 20+ innings. Stripping out defence, his 3.73 FIP suggests that his ERA had some help behind him. He missed bats on 20.7% of swings (9.8% of every pitch he threw), walked 9.0% of the batters he faced and struck out 18.6%. 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.

FIP3.73

K/97.0

WHIP1.39

WAR.4

WAR by season

Pitching

Standard and advanced, by season.


2026	SEA	36	0	39.2	4	2	1	40	15	31	15	3.40	3.73	1.39	7.0	3.4	81	89	0.4
2025	BOS	7	1	17.2	1	0	1	23	7	9	5	3.57	5.17	1.58	4.6	2.5	86	124	-0.1
2024	BOS	26	18	99.1	6	5	0	103	45	73	31	4.08	4.15	1.35	6.6	2.8	100	102	1.0
2023	TB	10	0	33.0	1	1	0	40	21	27	11	5.73	5.35	1.55	7.4	3.0	132	123	-0.2
2022	TB	1	1	3.1	0	0	0	2	1	4	1	2.70	1.61	0.90	10.8	2.7	68	41	0.1
2021	LAA	1	1	1.1	0	1	0	6	3	0	0	20.25	3.17	4.50	0.0	0.0	475	74	0.0

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	84	75	18	3	6	17	.240	.293	.427	.303	20.2%
vs RHB	83	72	22	0	9	14	.306	.386	.333	.329	16.9%

Pitch sequencing

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

ShowBatter

SinkerChangeupCutterSweeperFour-seam

Select a count to see exactly what Cooper Criswell throws in it.

Pitch arsenal

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

Season


Sinker	27.8%	175	90.7	2,059	49.1%	10.5%	44	.409	.947
Changeup	26.8%	169	85.3	1,547	42.0%	22.8%	48	.229	.637
Cutter	19.8%	125	87.0	2,307	50.4%	28.3%	25	.160	.690
Sweeper	17.9%	113	78.3	2,628	48.7%	25.0%	22	.227	.477
Four-Seam Fastball	7.0%	44	90.7	2,269	45.5%	26.3%	7	—	—

Cooper Criswell'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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Similar players

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

Antonio SenzatelaCOL

ERA: 4.07
FIP: 3.70
SO: 59
WAR: 0.9

Very close

Justin BruihlSTL

ERA: 3.81
FIP: 3.97
SO: 53
WAR: 0.6

Very close

Tyler SamaniegoBOS

ERA: 2.66
FIP: 3.54
SO: 17
WAR: 0.3

Very close

Keaton WinnSF

ERA: 3.35
FIP: 3.87
SO: 33
WAR: 0.4

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.