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, USA
- MLB debut
- September 8, 2024
- Drafted
- 2019, round CB-A
- College
- Campbell
- dbWAR
- -.1 3 season(s)
- IP
- 19.0
- ERA
- 5.21
- FIP
- 4.35
- K/9
- 11.8
- FIP−
- 104 100 = avg
Seth Johnson is a relief pitcher for the Philadelphia Phillies. In 2026 he struck out 25 batters over 19.0 innings across 18 appearances, going 1-0. His ERA of 5.21 was 24.8% higher than the league average of 4.18. Stripping out defence, his 4.35 FIP suggests he pitched better than his ERA shows. He missed bats on 29.4% of swings (13.0% of every pitch he threw), walked 16.1% of the batters he faced and struck out 26.9%. 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.
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 | 44 | 38 | 12 | 1 | 6 | 9 | .316 | .409 | .500 | .401 | 20.5% |
| vs RHB | 49 | 39 | 7 | 1 | 9 | 16 | .179 | .347 | .308 | .313 | 32.7% |
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, and how often it misses in 2026.
| Four-Seam Fastball | 186 | 97.9 | 2,389 | 45.7% | 32.1% | |
| Slider | 130 | 88.0 | 2,571 | 53.1% | 28.1% | |
| Sinker | 30 | 96.0 | 2,188 | 40.0% | 18.2% | |
| Curveball | 25 | 82.3 | 2,736 | 36.0% | 37.5% | |
| Sweeper | 10 | 84.8 | 2,723 | 40.0% | 25.0% |
Pitching
Standard and advanced, by season.
| Trend | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 18 | 0 | 19.0 | 1 | 0 | 0 | 19 | 11 | 25 | 15 | 5.21 | 4.35 | 1.79 | 11.8 | 7.1 | 125 | 104 | 0.1 | |
| 2025 | 10 | 0 | 12.2 | 1 | 1 | 0 | 11 | 6 | 17 | 4 | 4.26 | 4.48 | 1.18 | 12.1 | 2.8 | 103 | 108 | 0.0 | |
| 2024 | 1 | 1 | 2.1 | 0 | 1 | 0 | 8 | 9 | 0 | 3 | 34.71 | 12.60 | 4.71 | 0.0 | 11.6 | 851 | 309 | -0.2 |
Head to head
Put Seth Johnson 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.