Players · L · Pitcher · 2026 regular season
Seth Lonsway
- Age
- 28
- B/T
- L/L
- Height
- 6' 0"
- Weight
- 206 lb
- Number
- #86
- Born
- October 7, 1998 in St. Mary's, OH, United States
- MLB debut
- August 29, 2026
- Drafted
- 2017, round 19
- College
- Ohio State
- High school
- Celina
- dbWAR
- .1 Regular season, 1 season(s)
- IP
- 2.1
- ERA
- 7.71
- FIP
- 1.39
- K/9
- 7.7
- FIP−
- 33 100 = avg
Seth Lonsway is a relief pitcher for the San Francisco Giants. In 2026 he struck out 2 batters over 2.1 innings across 2 appearances, going 0-0. His ERA of 7.71 was 84.5% higher than the league average of 4.18. Stripping out defence, his 1.39 FIP suggests he pitched better than his ERA shows. He missed bats on 21.1% of swings (10.0% of every pitch he threw), walked 0.0% of the batters he faced and struck out 14.3%. 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 regular season.
Pitching Regular season
Standard and advanced, by season. Regular-season games only.
| Trend | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | SF | 2 | 0 | 2.1 | 0 | 0 | 0 | 7 | 2 | 2 | 0 | 7.71 | 1.39 | 3.00 | 7.7 | 0.0 | 184 | 33 | 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 | 4 | 4 | 1 | 0 | 0 | 1 | .250 | .250 | .250 | .223 | 25.0% |
| vs RHB | 10 | 10 | 6 | 0 | 0 | 1 | .600 | .600 | .600 | .536 | 10.0% |
Pitch sequencing
What Seth Lonsway 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 Lonsway throws in it.
Pitch arsenal
What he throws, how hard, how often it misses, and what hitters do with it.
| Sinker | 20 | 91.7 | 1,907 | 35.0% | 14.3% | 5 | — | — |
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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.