Oh wow, another big college lefty (6'4") who thrived in his final collegiate season after earlier struggles? Color me shocked.

In all seriousness, Book converted to being a full-time starter at Saint Joseph's this year after bouncing between the rotation and bullpen earlier in his college career. In a career-high 86 2/3 innings, he posted a 3.53 ERA and huge 35% strikeout rate, all while walking just 20 batters.

He really did struggle prior to 2025, though, allowing 59 earned runs in 76 innings at Stony Brook. This is a bet on a projectable, big frame with rapidly improving talent, and the Cubs' recent history with getting the most out of college pitchers should have fans more excited than nervous with Book.