Players · D · Pitcher · 2026

Jhonathan Díaz

Age: 30
B/T: L/L
Height: 6' 0"
Weight: 170 lb
Number: #74

Born: September 13, 1996 in Valencia, Venezuela
MLB debut: September 17, 2021

dbWAR: -.0
IP: 1.1
ERA: 6.75
FIP: 11.35
K/9: 6.8
FIP−: 272

Jhonathan Díaz is a relief pitcher for the Seattle Mariners. In 2026 he struck out 1 batter over 1.1 innings across 1 appearance, going 0-0. His ERA of 6.75 is 61.6% higher than the league average of 4.18. Stripping out defence, his 11.35 FIP suggests that his ERA had some help behind him. He missed bats on 0.0% of swings, walked 0.0% of the batters he faced and struck out 16.7%. 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.

FIP11.35

K/96.8

WHIP1.50

WAR-.1

WAR by season

Pitching

Standard and advanced, by season.


2026	SEA	1	0	1.1	0	0	2	1	1	0	6.75	11.35	1.50	6.8	0.0	162	272	-0.1
2025	SEA	1	0	1.1	0	0	1	0	1	0	0.00	1.64	0.75	6.8	0.0	0	39	0.0
2024	SEA	5	1	9.2	0	1	14	5	8	3	4.66	5.13	1.76	7.4	2.8	114	126	-0.1
2023	LAA	4	1	7.0	0	0	13	8	4	7	10.29	5.97	2.86	5.1	9.0	237	138	-0.1
2022	LAA	4	3	15.1	1	1	13	5	11	10	2.93	4.48	1.50	6.5	5.9	74	113	0.1
2021	LAA	3	2	13.0	1	0	11	6	9	7	4.15	4.63	1.38	6.2	4.8	97	109	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	4	4	2	1	0	0	.500	.500	1.250	.730	0.0%
vs RHB	2	2	0	0	0	1	.000	.000	.000	.000	50.0%

Pitch sequencing

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

ShowBatter

SinkerSweeper

Select a count to see exactly what Jhonathan Díaz throws in it.

Pitch arsenal

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

Season


Sinker	60.0%	15	88.7	2,172	60.0%	0.0%	4	—	—

Jhonathan Díaz'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

Put Jhonathan Díaz beside up to three others.

Compare — add up to 3 more players

Jhonathan Díaz

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.