Players · C · Pitcher · 2026 regular season

Luis Castillo

Age: 34
B/T: R/R
Height: 6' 2"
Weight: 200 lb
Number: #58

Born: December 12, 1992 in Bani, Dominican Republic
MLB debut: June 23, 2017
Salary, 2026: $24.1M

Compare with…vs Bryan Woo vs Patrick Corbin vs Logan Gilbert

dbWAR: 25.2
IP: 130.2
ERA: 5.85
FIP: 5.05
K/9: 7.7
FIP−: 121

Luis Castillo is a starting pitcher for the Seattle Mariners. In 2026 he struck out 112 batters over 130.2 innings across 29 appearances, 23 of them starts, going 4-11. His ERA of 5.85 was 40.0% higher than the league average of 4.18 — the worst on his team, and 475th of 539 among MLB pitchers with 20+ innings. Stripping out defence, his 5.05 FIP suggests he pitched better than his ERA shows. He missed bats on 23.7% of swings (12.3% of every pitch he threw), walked 7.4% of the batters he faced and struck out 18.9%. His 0.0 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.

FIP5.05

K/97.7

WHIP1.49

WAR.0

WAR by season

Pitching Regular season

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


2026	SEA/CWS	29	23	130.2	4	11	151	85	112	44	5.85	5.05	1.49	7.7	3.0	140	121	0.0
2025	SEA	32	32	180.2	11	8	168	71	162	46	3.54	3.88	1.18	8.1	2.3	85	93	2.6
2024	SEA	30	30	175.1	11	12	158	71	175	47	3.64	3.91	1.17	9.0	2.4	89	96	2.2
2023	SEA	33	33	197.0	14	9	160	73	219	56	3.34	3.81	1.10	10.0	2.6	77	88	3.4
2022	CIN/SEA	25	25	150.1	8	6	118	50	167	45	2.99	3.07	1.08	10.0	2.7	75	77	3.6
2021	CIN	33	33	187.2	8	16	181	83	192	75	3.98	3.75	1.36	9.2	3.6	93	88	3.8
2020	CIN	12	12	70.0	4	6	62	25	89	24	3.21	2.65	1.23	11.4	3.1	72	59	2.4
2019	CIN	32	32	190.2	15	8	139	72	226	79	3.40	3.70	1.14	10.7	3.7	75	82	4.1
2018	CIN	31	31	169.2	10	12	158	81	165	49	4.30	4.32	1.22	8.8	2.6	104	104	1.9
2017	CIN	15	15	89.1	3	7	64	31	98	32	3.12	3.74	1.07	9.9	3.2	72	86	1.7

Batting Regular season

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


2024	SEA	1	1	0	0	0	1	.000	.000	.000	.000	—	0.0%	100.0%	.000	-0.3	-128	0.0
2021	CIN	30	59	8	2	1	23	.163	.180	.204	.041	.308	1.7%	39.0%	.170	-7.3	-2	0.2
2019	CIN	31	66	6	0	0	32	.097	.097	.113	.016	.200	0.0%	48.5%	.090	-13.1	-57	-0.3
2018	CIN	30	65	6	2	2	23	.102	.131	.119	.017	.167	3.1%	35.4%	.116	-10.6	-39	-0.1
2017	CIN	14	33	2	1	1	11	.069	.100	.069	.000	.111	3.0%	33.3%	.082	-6.7	-65	-0.2

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 Luis Castillo's postseason pitching, by October and round. Not part of any regular-season figure on this page.
Season	Team	Round	G	GS	IP	W	L	H	ER	HR	BB	SO	ERA	WHIP	K/9
2025 Post	SEA	Postseason total	3	2	8.1	1	1	6	3	1	5	5	3.24	1.32	5.4
		ALDS	2	1	6.0	1	0	1	0	0	4	4	0.00	0.83	6.0
		ALCS	1	1	2.1	0	1	5	3	1	1	1	11.57	2.57	3.9
2022 Post	SEA	Postseason total	2	2	14.1	1	1	11	3	2	0	12	1.88	0.77	7.5
		Wild Card	1	1	7.1	1	0	6	0	0	0	5	0.00	0.82	6.1
		ALDS	1	1	7.0	0	1	5	3	2	0	7	3.86	0.71	9.0
2020 Post	CIN	Wild Card	1	1	5.1	0	1	6	1	0	1	7	1.69	1.31	11.8
Career		Postseason total · 3 Octobers	6	5	28.0	2	3	23	7	3	6	24	2.25	1.04	7.7

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	339	303	88	17	27	55	.290	.354	.538	.382	16.2%
vs RHB	253	228	63	8	17	57	.276	.331	.434	.336	22.5%

Pitch sequencing

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

ShowBatter

Four-seamSliderSinkerChangeup

Select a count to see exactly what Luis Castillo throws in it.

Pitch arsenal

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

Season


Four-Seam Fastball	42.4%	1,004	95.2	2,264	50.2%	26.1%	215	.242	.840
Slider	24.6%	583	85.6	2,236	48.5%	26.9%	116	.293	.934
Sinker	18.3%	433	95.4	2,084	45.3%	10.8%	112	.313	.751
Changeup	14.6%	346	87.4	1,968	36.7%	25.3%	90	.333	.791

Luis Castillo'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.

Patrick CorbinTOR

ERA: 5.51
FIP: 4.64
SO: 63
WAR: 0.5

Very close

Andrew PainterPHI

ERA: 5.40
FIP: 4.67
SO: 115
WAR: 0.9

Very close

Mike BurrowsHOU

ERA: 5.99
FIP: 5.64
SO: 75
WAR: -0.5

Very close

Brady SingerCIN

ERA: 5.85
FIP: 5.62
SO: 126
WAR: -0.8

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.