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Justin Martinez

Diamondbacks
Number #63
Position RP
Bats R
Throws R
Age 25
Height 6' 3"
Weight 225 lbs
Birth Place Bonao, Dominican Republic
Born Jul 30, 2001

Key Insights

2026
His fastball is the pitch everything else is built on

Martinez's 4-seam fastball averages 101.6 mph, and has touched 103.4.

86 thrown, 37.1% of his pitches.
This is the pitch he goes to when he needs the out

With two strikes Martinez goes to the splitter: 50% of his two-strike pitches, against 11.1% the rest of the time.

70 two-strike pitches in 2026.
When he falls behind, hitters know exactly what is coming

Behind in the count Martinez throws a fastball 80% of the time, against 44.8% when he is ahead.

70 pitches behind in the count, 67 ahead.
One pitch of his runs sideways more than almost anyone's

Martinez's sinker moves 15.6 inches toward the third-base side, the biggest horizontal move in his arsenal.

82 thrown, averaging 101.8 mph.
He saves one pitch for one side of the plate

Martinez throws the sinker 49.2% of the time against right-handers and 21.1% against left-handers.

118 pitches to right-handers, 114 to left-handers.
The angle he throws from is unusual, and hitters notice

Martinez releases the ball from a low three-quarters slot, about 33 degrees above horizontal and 2.5 feet to the third-base side of the rubber.

232 tracked release points, averaging 6.0 feet off the ground.

Movement Profile (Induced Break)

Catcher's Perspective • Pitch movement relative to a spinless ball

Player Bio Data
DOB Jul 30, 2001
Birth Place Bonao, Dominican Republic
Height 6' 3"
Weight 225 lbs LBS
Bats/Throws R/R