After helping his high school win an Oregon state title in 2023, Kleinschmit went the junior college route, spending a year and earning All-American status at Linn-Benton Community College. He made a seamless transition into Oregon State's rotation in 2025, striking out 11.2 K/9 and holding hitters to a .194 batting average. More success pitching on the weekends for the Beavers could help him be one of the first college lefties to come off the board in July.

During his first season in Corvallis, Kleinschmit showed the ability to fill up the strike zone with three pitches. While he won't overwhelm anyone with pure stuff, he makes up for it with movement and feel for pitching. His fastball typically sat in the 90-93 mph range in 2025, topping out at 95 mph, with good tailing life and scouts wonder what an uptick in velocity might do for his profile. He has good rotation and depth with his upper-70s slurvy slider to go along with decent feel and deception with his low-80s changeup. Kleinschmit has a solid starting pitcher's foundation with his pitch mix and ability to be around the zone.

#3: Ethan Kleinschmit, Oregon State, LHP

Kleinschmit is all over the place in terms of where publications have him going in the draft. He's a big lefty with a nice two-plane fastball as his foundation with two good glove-side shapes in his slider and sweeper. pic.twitter.com/D2rBSvnVAY

— Boston (@BallByBoston) July 10, 2026

This is the third consecutive year that the Marlins have used an early-round pick on an Oregon State player (previously Aiden May in 2024 and Aiva Arquette in 2025).