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Hahn has been long-known to scouts by virtue of playing at Huntington Beach (Calif.) High, which in recent years produced top draft picks Nick Pratto and Hagen Danner and has been an annual participant in both the National High School Invitational and Boras Classic. Hahn helped himself this spring when he touched 93 mph and struck out seven in a marquee matchup with top 2020 prospect Jared Jones to open the Boras Classic. Hahn is a two-way prospect most teams prefer as a lefthanded pitcher. He pitches at 88-91 mph and pounds the zone with impressive command for a prep. He shows excellent arm speed on a swing-and-miss low-80s changeup, although his loopy, low-70s curveball needs work. At the plate Hahn hits velocity and shows raw power, but he is limited to first base defensively. He is committed to UCLA and will be an expensive sign.