Players · C · Pitcher · 2026

Tom Cosgrove

Washington Nationals National League East

Age: 30
B/T: L/L
Height: 6' 2"
Weight: 190 lb
Number: #34

Born: June 14, 1996 in Staten Island, NY, United States
MLB debut: April 29, 2023
Drafted: 2017, round 12
College: Manhattan

dbWAR: .5
IP: 16.1
ERA: 7.71
FIP: 5.25
K/9: 7.7
FIP−: 126

Tom Cosgrove is a relief pitcher for the Washington Nationals. In 2026 he struck out 14 batters over 16.1 innings across 18 appearances, going 1-2. His ERA of 7.71 is 84.6% higher than the league average of 4.18. Stripping out defence, his 5.25 FIP suggests he pitched better than his ERA shows. He missed bats on 16.8% of swings (8.6% of every pitch he threw), walked 8.1% of the batters he faced and struck out 18.9%. His -0.1 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.

FIP5.25

K/97.7

WHIP1.47

WAR-.1

WAR by season

Pitching

Standard and advanced, by season.


2026	WSH	18	16.1	1	2	1	18	14	14	6	7.71	5.25	1.47	7.7	3.3	185	126	-0.1
2025	CHC	2	4.0	0	0	0	3	1	3	1	2.25	2.39	1.00	6.8	2.3	54	57	0.1
2024	SD	18	14.2	0	1	0	23	19	15	6	11.66	5.83	1.98	9.2	3.7	286	143	-0.2
2023	SD	54	51.1	1	2	1	31	10	44	19	1.75	3.70	0.97	7.7	3.3	40	85	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	31	26	6	1	1	7	.231	.290	.462	.317	22.6%
vs RHB	43	36	12	2	5	7	.333	.395	.639	.429	16.3%

Pitch sequencing

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

ShowBatter

SweeperFour-seamSinker

Select a count to see exactly what Tom Cosgrove throws in it.

Pitch arsenal

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

Season


Sweeper	66.4%	178	73.4	2,798	50.0%	15.3%	37	.243	.764
Four-Seam Fastball	28.0%	75	88.6	2,523	48.0%	20.5%	20	.350	1.159
Sinker	5.6%	15	88.3	2,523	33.3%	12.5%	5	—	—

Tom Cosgrove'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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Tom Cosgrove

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.