Players · K · Pitcher · 2026

Matt Krook

Washington Nationals National League East

Age: 32
B/T: L/L
Height: 6' 4"
Weight: 225 lb

Born: October 21, 1994 in Hillsborough, CA, United States
MLB debut: June 16, 2023
Drafted: 2013, round CB-A
College: Oregon
High school: Saint Ignatius

dbWAR: -.6
IP: 8.1
ERA: 10.80
FIP: 8.38
K/9: 9.7
FIP−: 201

Matt Krook is a relief pitcher for the Washington Nationals. In 2026 he struck out 9 batters over 8.1 innings across 11 appearances, going 0-1. His ERA of 10.80 is 158.5% higher than the league average of 4.18. Stripping out defence, his 8.38 FIP suggests he pitched better than his ERA shows. He missed bats on 25.7% of swings (10.6% of every pitch he threw), walked 21.7% of the batters he faced and struck out 19.6%. His -0.3 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.

FIP8.38

K/99.7

WHIP2.28

WAR-.3

WAR by season

Pitching

Standard and advanced, by season.


2026	WSH/ATH	11	8.1	1	9	10	9	10	10.80	8.38	2.28	9.7	10.8	258	201	-0.3
2025	ATH	3	3.1	0	5	2	3	1	5.40	2.24	1.80	8.1	2.7	130	54	0.1
2024	BAL	1	1.0	0	1	2	2	1	18.00	15.17	2.00	18.0	9.0	441	372	-0.1
2023	NYY	4	4.0	0	8	11	3	6	24.75	9.51	3.50	6.8	13.5	571	219	-0.2

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	22	18	4	2	4	6	.222	.364	.667	.431	27.3%
vs RHB	24	16	5	0	6	3	.313	.542	.313	.430	12.5%

Pitch sequencing

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

ShowBatter

SweeperSinkerCutter

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Pitch arsenal

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

Season


Sweeper	52.0%	93	82.1	2,715	43.0%	33.3%	20	.300	1.162
Sinker	43.6%	78	89.6	2,007	43.6%	16.1%	13	—	—

Matt Krook'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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Matt Krook

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.