Players · F · Pitcher · 2026

José A. Ferrer

Age: 26
B/T: L/L
Height: 6' 1"
Weight: 233 lb
Number: #45

Born: March 3, 2000 in Maimon, Dominican Republic
MLB debut: July 1, 2023

dbWAR: 2.7
IP: 64.1
ERA: 3.92
FIP: 4.00
K/9: 7.6
FIP−: 96

José A. Ferrer is a relief pitcher for the Seattle Mariners. In 2026 he struck out 54 batters over 64.1 innings across 72 appearances, going 4-4. His ERA of 3.92 is 6.2% lower than the league average of 4.18 — 5th of 16 on his team, and 249th of 538 among MLB pitchers with 20+ innings. Stripping out defence, his 4.00 FIP suggests the ERA was no fluke. He missed bats on 19.4% of swings (9.8% of every pitch he threw), walked 6.3% of the batters he faced and struck out 18.8%. His 0.5 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.

FIP4.00

K/97.6

WHIP1.41

WAR.5

WAR by season

Pitching

Standard and advanced, by season.


2026	SEA	72	64.1	4	4	3	73	28	54	18	3.92	4.00	1.41	7.6	2.5	94	96	0.5
2025	WSH	72	76.1	4	4	11	81	38	71	16	4.48	3.03	1.27	8.4	1.9	108	73	1.5
2024	WSH	31	32.0	1	0	1	27	12	25	6	3.38	2.76	1.03	7.0	1.7	83	68	0.7
2023	WSH	39	34.0	3	0	0	37	19	25	13	5.03	4.55	1.47	6.6	3.4	116	105	0.1

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	142	135	33	0	2	28	.244	.271	.289	.252	19.7%
vs RHB	146	126	40	7	16	26	.317	.411	.524	.407	17.8%

Pitch sequencing

What José A. Ferrer throws in each count, and what he follows each pitch with. Select any cell for the breakdown.

ShowBatter

SinkerChangeupSliderFour-seam

Select a count to see exactly what José A. Ferrer throws in it.

Pitch arsenal

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

Season


Sinker	69.1%	737	97.5	2,142	52.9%	12.8%	186	.290	.783
Changeup	17.8%	190	87.5	2,241	32.1%	42.5%	47	.149	.354
Slider	12.5%	133	88.4	2,452	39.1%	29.1%	30	.400	1.021

José A. Ferrer'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.

Andrew KittredgeBAL

ERA: 3.54
FIP: 3.74
SO: 40
WAR: 0.5

Very close

Casey LeguminaTB

ERA: 3.82
FIP: 3.98
SO: 55
WAR: 0.7

Very close

José UrquidyCWS

ERA: 4.54
FIP: 3.84
SO: 27
WAR: 0.3

Very close

Wandy PeraltaSD

ERA: 3.61
FIP: 3.99
SO: 50
WAR: 0.6

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.