Cardinals Prospect Cooper Hjerpe Is a Southpaw With Deception

Cooper Hjerpe is catching up for lost time in the Arizona Fall League. St. Louis’ first-round pick (22nd overall) in 2022, the 22-year-old southpaw was out of action from late May to early September due to an elbow issue and ended up tossing just 41 innings. He was effective when healthy. Throwing from what my colleague Eric Longenhagen has called “a funky low-slot delivery,” Hjerpe fanned 51 batters, allowed 26 hits and posted a 3.51 ERA with High-A Peoria.
The Oregon State University product’s AFL stint with the Scottsdale Scorpions included a two-batter appearance in Sunday night’s Fall Stars game. Entering in the eighth inning, Hjerpe retired fellow former first-rounders Max Muncy and Jace Jung, the latter on a swinging strike. I caught up to the deceptive lefty after the game to ask about his pitch metrics and approach on the mound.
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David Laurila: We should start with a health update. What was the procedure you had this summer, and how is your elbow now?
Cooper Hjerpe: “I had what’s called arthroscopy surgery. A microscope went in there and took out bodies of cartilage. There were two pieces of cartilage at the front and the back of the elbow; they took them out and shaved what they came off of. It wasn’t like reconstruction surgery or anything like that. Everything is back to normal.”
Laurila: You throw from a low slot and approach angle, so I’m interested in what you can tell me about your pitch metrics.
Hjerpe: “The heater has changed a little bit. I don’t know if it’s the balls or what, but right now it has been like 10 vertical and 18 horizontal. The slider is anywhere from zero to negative-four vertical, with 14 to 16 HB [horizontal break]. The changeup is anywhere from positive-two to negative-three vertical, and negative-19 horizontal. The cutter, which I’m still working on, is 10 to 13 vert and around zero horizontal.” Read the rest of this entry »