Players · H · Pitcher · 2026 regular season
Cooper Hjerpe
- Age
- 25
- B/T
- L/L
- Height
- 6' 3"
- Weight
- 200 lb
- Number
- #56
- Born
- March 16, 2001 in Davis, CA, United States
- MLB debut
- September 6, 2026
- Drafted
- 2022, round 1
- College
- Oregon State
- High school
- Woodland
- dbWAR
- .2 Regular season, 1 season(s)
- IP
- 12.1
- ERA
- 4.38
- FIP
- 3.35
- K/9
- 10.9
- FIP−
- 80 100 = avg
Cooper Hjerpe is a relief pitcher for the St. Louis Cardinals. In 2026 he struck out 15 batters over 12.1 innings across 4 appearances, going 1-0. His ERA of 4.38 was 4.7% higher than the league average of 4.18. Stripping out defence, his 3.35 FIP suggests he pitched better than his ERA shows. He missed bats on 24.8% of swings (11.0% of every pitch he threw), walked 16.4% of the batters he faced and struck out 27.3%. His 0.2 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 | STL | 4 | 0 | 12.1 | 1 | 0 | 0 | 7 | 6 | 15 | 9 | 4.38 | 3.35 | 1.30 | 10.9 | 6.6 | 105 | 80 | 0.2 | — |
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 | 28 | 19 | 3 | 0 | 6 | 7 | .158 | .393 | .211 | .317 | 25.0% |
| vs RHB | 27 | 24 | 4 | 0 | 3 | 8 | .167 | .259 | .208 | .226 | 29.6% |
Pitch sequencing
What Cooper Hjerpe throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what Cooper Hjerpe throws in it.
Pitch arsenal
What he throws, how hard, how often it misses, and what hitters do with it.
| Four-Seam Fastball | 132 | 90.4 | 2,039 | 53.0% | 24.1% | 20 | .200 | .643 | |
| Sweeper | 58 | 77.5 | 2,444 | 50.0% | 37.5% | 8 | — | — | |
| Changeup | 40 | 81.0 | 2,226 | 42.5% | 23.8% | 12 | — | — | |
| Cutter | 24 | 86.2 | 1,997 | 54.2% | 0.0% | 3 | — | — |
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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.