Players · R · Pitcher · 2026
Jack Ralston
- Age
- 29
- B/T
- R/R
- Height
- 6' 6"
- Weight
- 231 lb
- Number
- #79
- Born
- August 13, 1997 in Panorama City, CA, United States
- MLB debut
- August 23, 2026
- Drafted
- 2019, round 7
- College
- UCLA
- High school
- Hart
- dbWAR
- -.1 1 season(s)
- IP
- 13.2
- ERA
- 3.95
- FIP
- 5.30
- K/9
- 9.9
- FIP−
- 126 100 = avg
Jack Ralston is a relief pitcher for the Miami Marlins. In 2026 he struck out 15 batters over 13.2 innings across 13 appearances, going 0-1. His ERA of 3.95 is 5.6% lower than the league average of 4.19. Stripping out defence, his 5.30 FIP suggests that his ERA had some help behind him. He missed bats on 21.6% of swings (8.1% of every pitch he threw), walked 12.3% of the batters he faced and struck out 26.3%. 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.
Pitching
Standard and advanced, by season.
| Trend | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | MIA | 13 | 0 | 13.2 | 0 | 1 | 0 | 9 | 6 | 15 | 7 | 3.95 | 5.30 | 1.17 | 9.9 | 4.6 | 94 | 126 | -0.1 | — |
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 | 39 | 33 | 5 | 2 | 5 | 8 | .152 | .263 | .364 | .282 | 20.5% |
| vs RHB | 18 | 16 | 4 | 1 | 2 | 7 | .250 | .333 | .438 | .342 | 38.9% |
Pitch sequencing
What Jack Ralston throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what Jack Ralston throws in it.
Pitch arsenal
What he throws, how hard, how often it misses, and what hitters do with it.
| Splitter | 125 | 82.5 | 876 | 42.4% | 25.0% | 29 | .207 | .552 | |
| Four-Seam Fastball | 56 | 93.7 | 2,262 | 58.9% | 27.8% | 10 | — | — | |
| Slider | 53 | 85.2 | 2,019 | 45.3% | 5.6% | 10 | — | — |
Head to head
Put Jack Ralston 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.