Players · J · Pitcher · 2026
Seth Johnson
- Age
- 28
- B/T
- R/R
- Height
- 6' 1"
- Weight
- 205 lb
- Number
- #52
- Born
- September 19, 1998 in Concord, NC, United States
- MLB debut
- September 8, 2024
- Drafted
- 2019, round CB-A
- College
- Campbell
- dbWAR
- -.1 3 season(s)
- IP
- 32.0
- ERA
- 6.19
- FIP
- 4.63
- K/9
- 10.7
- FIP−
- 111 100 = avg
Seth Johnson is a relief pitcher for the Philadelphia Phillies. In 2026 he struck out 38 batters over 32.0 innings across 27 appearances, going 1-0. His ERA of 6.19 is 48.1% higher than the league average of 4.18 — 15th of 17 on his team, and 499th of 538 among MLB pitchers with 20+ innings. Stripping out defence, his 4.63 FIP suggests he pitched better than his ERA shows. He missed bats on 27.1% of swings (12.5% of every pitch he threw), walked 12.0% of the batters he faced and struck out 25.3%. 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.
WAR by season
Pitching
Standard and advanced, by season.
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 | 69 | 62 | 18 | 2 | 7 | 14 | .290 | .362 | .468 | .366 | 20.3% |
| vs RHB | 81 | 68 | 18 | 3 | 11 | 24 | .265 | .383 | .485 | .384 | 29.6% |
Pitch sequencing
What Seth Johnson throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what Seth Johnson throws in it.
Pitch arsenal
What he throws, how hard, how often it misses, and what hitters do with it.
| Four-Seam Fastball | 267 | 97.8 | 2,382 | 46.8% | 27.7% | 59 | .305 | .954 | |
| Slider | 188 | 88.3 | 2,553 | 53.2% | 29.5% | 39 | .282 | .897 | |
| Sinker | 55 | 95.6 | 2,131 | 34.5% | 7.7% | 16 | .250 | .669 | |
| Curveball | 30 | 82.4 | 2,759 | 40.0% | 45.5% | 3 | — | — | |
| Sweeper | 25 | 84.9 | 2,732 | 40.0% | 31.3% | 13 | — | — |
Head to head
Put Seth Johnson beside up to three others.
Similar players
Nearest 2026 seasons by command, run prevention and role, on rate statistics rather than totals.
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.