Players · K · Pitcher · 2026 regular season
John Klein
- Age
- 24
- B/T
- R/R
- Height
- 6' 5"
- Weight
- 225 lb
- Number
- #65
- Born
- April 22, 2002 in Brooklyn Park, MN, United States
- MLB debut
- May 2, 2026
- College
- Iowa Central CC
- dbWAR
- -.0 Regular season, 1 season(s)
- IP
- 8.1
- ERA
- 2.16
- FIP
- 5.14
- K/9
- 7.6
- FIP−
- 123 100 = avg
John Klein is a relief pitcher for the Minnesota Twins. In 2026 he struck out 7 batters over 8.1 innings across 4 appearances, going 0-1. His ERA of 2.16 was 48.3% lower than the league average of 4.18. Stripping out defence, his 5.14 FIP suggests that his ERA had some help behind him. He missed bats on 17.4% of swings (8.1% of every pitch he threw), walked 17.1% of the batters he faced and struck out 20.0%. His -0.0 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.
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 | 19 | 13 | 3 | 1 | 5 | 3 | .231 | .421 | .692 | .450 | 15.8% |
| vs RHB | 16 | 15 | 2 | 0 | 1 | 4 | .133 | .188 | .133 | .157 | 25.0% |
Pitch sequencing
What John Klein throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what John Klein throws in it.
Pitch arsenal
What he throws, how hard, how often it misses, and what hitters do with it.
| Four-Seam Fastball | 68 | 94.8 | 2,401 | 58.8% | 16.1% | 11 | — | — | |
| Changeup | 40 | 86.6 | 1,594 | 35.0% | 27.8% | 8 | — | — | |
| Curveball | 16 | 80.4 | 2,454 | 43.8% | 0.0% | 2 | — | — | |
| Cutter | 14 | 86.6 | 2,212 | 50.0% | 0.0% | 3 | — | — | |
| Sweeper | 10 | 82.3 | 2,363 | 50.0% | 33.3% | 4 | — | — |
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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.