Players · M · Pitcher · 2026 regular season

Justin Martinez

Arizona Diamondbacks National League West

Age: 25
B/T: R/R
Height: 6' 3"
Weight: 225 lb
Number: #63

Born: July 30, 2001 in Bonao, Dominican Republic
MLB debut: July 7, 2023
Salary, 2026: $2.4M

dbWAR: 1.9
IP: 13.1
ERA: 2.02
FIP: 2.88
K/9: 12.1
FIP−: 69

Justin Martinez is a relief pitcher for the Arizona Diamondbacks. In 2026 he struck out 18 batters over 13.1 innings across 15 appearances, going 3-1. His ERA of 2.02 was 51.6% lower than the league average of 4.18. Stripping out defence, his 2.88 FIP suggests that his ERA had some help behind him. He missed bats on 31.0% of swings (11.6% of every pitch he threw), walked 18.2% of the batters he faced and struck out 32.7%. 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 regular season.

FIP2.88

K/912.1

WHIP1.13

WAR.3

WAR by season

Pitching Regular season

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


2026	AZ	15	13.1	3	1	0	5	3	18	10	2.02	2.88	1.13	12.1	6.8	48	69	0.3
2025	AZ	17	15.1	1	2	5	7	7	22	12	4.11	4.05	1.24	12.9	7.0	99	97	0.1
2024	AZ	64	72.2	5	6	8	59	20	91	36	2.48	2.59	1.31	11.3	4.5	61	63	1.8
2023	AZ	10	10.0	0	0	1	13	14	14	11	12.60	6.96	2.40	12.6	9.9	291	161	-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	27	21	3	0	5	8	.143	.296	.238	.261	29.6%
vs RHB	28	22	2	0	5	10	.091	.286	.091	.220	35.7%

Pitch sequencing

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

ShowBatter

Four-seamSinkerSplitterSlider

Select a count to see exactly what Justin Martinez throws in it.

Pitch arsenal

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

Season


Four-Seam Fastball	37.1%	86	101.6	2,308	39.5%	32.3%	16	.063	.335
Sinker	35.3%	82	101.8	2,146	50.0%	13.3%	13	—	—
Splitter	23.3%	54	90.3	723	46.3%	50.0%	14	—	—
Slider	4.3%	10	93.3	2,357	50.0%	50.0%	0	—	—

Justin Martinez'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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Justin Martinez

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.