Players · C · Pitcher · 2026 regular season

Blas Castaño

Age: 28
B/T: R/R
Height: 5' 10"
Weight: 162 lb
Number: #63

Born: September 8, 1998 in Espaillat, Dominican Republic
MLB debut: May 28, 2025

Compare with…vs Albert Suárez vs Reiver Sanmartin vs Trent Thornton

dbWAR: -.1
IP: 27.1
ERA: 3.62
FIP: 4.68
K/9: 6.9
FIP−: 112

Blas Castaño is a relief pitcher for the Colorado Rockies. In 2026 he struck out 21 batters over 27.1 innings across 15 appearances, going 2-0. His ERA of 3.62 was 13.4% lower than the league average of 4.18 — the second best on his team, and 180th of 539 among MLB pitchers with 20+ innings. Stripping out defence, his 4.68 FIP suggests that his ERA had some help behind him. He missed bats on 18.6% of swings (8.7% of every pitch he threw), walked 8.1% 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.

FIP4.68

K/96.9

WHIP1.32

WAR.0

WAR by season

Pitching Regular season

Standard and advanced, by season. Regular-season games only.

																				Trend
2026	COL	15	0	27.1	2	0	0	27	11	21	9	3.62	4.68	1.32	6.9	3.0	87	112	0.0
2025	SEA	1	0	3.0	0	0	0	4	3	1	2	9.00	9.80	2.00	3.0	6.0	216	236	-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	55	47	19	3	6	4	.404	.473	.702	.496	7.3%
vs RHB	56	52	8	1	3	17	.154	.214	.250	.213	30.4%

Pitch sequencing

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

ShowBatter

SinkerSweeperCutterFour-seamChangeup

Select a count to see exactly what Blas Castaño throws in it.

Pitch arsenal

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

Season


Sinker	40.4%	186	94.1	2,130	53.8%	13.3%	32	.219	.637
Sweeper	23.5%	108	82.8	2,578	42.6%	34.0%	23	.174	.600
Cutter	13.9%	64	90.5	2,428	48.4%	17.2%	11	—	—
Four-Seam Fastball	12.0%	55	94.5	2,238	49.1%	12.1%	19	.158	.396
Changeup	10.2%	47	89.0	1,527	34.0%	17.4%	15	.333	.800

Blas Castaño'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.

Reiver SanmartinSF

ERA: 4.22
FIP: 4.42
SO: 16
WAR: 0.1

Very close

Albert SuárezBAL

ERA: 3.86
FIP: 4.25
SO: 46
WAR: 0.3

Very close

Pierce JohnsonCIN

ERA: 4.62
FIP: 4.69
SO: 42
WAR: -0.0

Very close

Trevor RichardsCWS

ERA: 3.69
FIP: 4.20
SO: 73
WAR: 0.5

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.