Rosario signed with the Marlins for $125K the day after his 16th birthday in 2016. He’s still just 18-years-old and got in his first official pro games last year in the DSL. Rosario’s 6-foot, 160-pound frame is extremely twitchy and athletic, with a high, trim waist and v-torso. He hits with a loose, whippy stroke that projects to get quicker as he gets stronger. There’s athletic balance through the swing’s finish, with hands and hips well-synced through contact. While he isn’t the biggest guy on the field, Rosario’s fast bat and natural leverage allow surprising juice to the gaps right now, with consistent hard game contact when squared. He showed off extra-base pop in the DSL last summer, and when you add it all up, it’s reasonable to project some power down the road. Like the majority of young hitters on the complex, adjusting to pro-quality breaking stuff will be a change he’ll need to make moving forward.

Rosario is an above-average to plus runner, getting up the line from the right side with consistent 4.10 to 4.16 times. His athleticism shows up on defense, too, currently moving between shortstop and CF (with time spent at 2B and 3B at the pro level as well). The speed, center-diamond profile, and tools on both sides of the ball make Rosario a prospect in the FV 40 tier despite still being at least a year away from full-season ball, if not two. He’s raw but has interesting natural ability and lots of remaining projection.