Pitcher · 2025
Justin Martinez
- Age
- 24
- 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, 2025
- $1.9M
- dbWAR
- 1.7 2 season(s)
- IP
- 15.1
- ERA
- 4.11
- FIP
- 4.05
- K/9
- 12.9
- FIP−
- 97 100 = avg
Justin Martinez is a relief pitcher for the Arizona Diamondbacks. In 2025 he struck out 22 batters over 15.1 innings across 17 appearances, going 1-2. His ERA of 4.11 was 1.2% lower than the league average of 4.16. Stripping out defence, his 4.05 FIP suggests the ERA was no fluke. He missed bats on 36.6% of swings (13.9% of every pitch he threw), walked 17.9% of the batters he faced and struck out 32.8%. 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, 2025.
Platoon splits
How left- and right-handed hitters fare against him.
| Split | PA | AB | H | HR | BB | SO | AVG | OBP | SLG | wOBA | K% |
|---|---|---|---|---|---|---|---|---|---|---|---|
| vs LHB | 37 | 28 | 2 | 0 | 9 | 16 | .071 | .297 | .107 | .233 | 43.2% |
| vs RHB | 30 | 24 | 5 | 1 | 3 | 6 | .208 | .367 | .375 | .330 | 20.0% |
Pitch sequencing
What Justin Martinez throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what Justin Martinez throws in it.
Pitch arsenal
What he throws, how hard, and how often it misses in 2025.
| Splitter | 86 | 88.0 | 709 | 46.5% | 58.6% | |
| Sinker | 85 | 99.3 | 2,094 | 45.9% | 8.6% | |
| Four-Seam Fastball | 72 | 100.0 | 2,255 | 47.2% | 44.8% | |
| Slider | 24 | 91.4 | 2,371 | 37.5% | 50.0% |
Pitching
Standard and advanced, by season.
| Trend | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025 | 17 | 0 | 15.1 | 1 | 2 | 5 | 7 | 7 | 22 | 12 | 4.11 | 4.05 | 1.24 | 12.9 | 7.0 | 99 | 97 | 0.1 | |
| 2024 | 64 | 0 | 72.2 | 5 | 6 | 8 | 59 | 20 | 91 | 36 | 2.48 | 2.59 | 1.31 | 11.3 | 4.5 | 61 | 63 | 1.6 |
Head to head
Put Justin Martinez beside up to three others.
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.