Players · H · Pitcher · 2026
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 1 season(s)
- IP
- 9.0
- ERA
- 6.00
- FIP
- 3.10
- K/9
- 12.0
- FIP−
- 74 100 = avg
Cooper Hjerpe is a relief pitcher for the St. Louis Cardinals. In 2026 he struck out 12 batters over 9.0 innings across 3 appearances, going 1-0. His ERA of 6.00 is 43.3% higher than the league average of 4.19. Stripping out defence, his 3.10 FIP suggests he pitched better than his ERA shows. He missed bats on 23.2% of swings (10.6% of every pitch he threw), walked 15.4% of the batters he faced and struck out 30.8%. 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.
Pitching
Standard and advanced, by season.
| Trend | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | STL | 3 | 0 | 9.0 | 1 | 0 | 0 | 4 | 6 | 12 | 6 | 6.00 | 3.10 | 1.11 | 12.0 | 6.0 | 143 | 74 | 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 | 20 | 13 | 2 | 0 | 4 | 5 | .154 | .400 | .231 | .327 | 25.0% |
| vs RHB | 19 | 17 | 2 | 0 | 2 | 7 | .118 | .211 | .176 | .189 | 36.8% |
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 | 83 | 90.8 | 2,038 | 59.0% | 23.1% | 12 | — | — | |
| Sweeper | 51 | 77.6 | 2,442 | 51.0% | 33.3% | 7 | — | — | |
| Changeup | 25 | 80.9 | 2,228 | 36.0% | 23.1% | 9 | — | — | |
| Cutter | 21 | 86.2 | 1,984 | 61.9% | 0.0% | 2 | — | — |
Head to head
Put Cooper Hjerpe 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.