Rosario is five years younger than the average player in the Pacific Coast League, and yet he’s displayed some of the most dynamic tools throughout the league in 2017. He is slashing .314/.357/.465 through 77 games, and is pushing the envelope for a promotion to The Show.
The 21-year-old displays outstanding hand-eye coordination and well-above-average bat speed with plus bat-to-ball skills. Rosario usually has a patient approach at the plate, but won’t hesitate to ambush fastballs that catch the fat part of the plate early in the count if given the opportunity. He consistently makes hard contact to all fields, and should grow into an average power profile with some projection left in his wirey-athletic frame.
Rosario has double-plus raw speed and is a legitimate base-stealing threat. Although, he isn’t an ultra-aggressive basestealer, he has good baserunning instincts, and will go from first-to-third base and score from first on a double, most times with ease.
Rosario has such smooth actions that sometimes his nonchalant demeanor can be mistaken for laziness, however they are anything but lackadaisical. Rosario’s speed and athleticism play well at shortstop, and he has soft hands and clean footwork that allow him to cover a lot of real estate and make strong, accurate throws. He also displays a flare for the tough play with a good game clock that allows him to slow the game down pretty effortlessly.
Being just 21 years old and developing his tools at the Triple-A level speaks to how much the Mets think of him. He has all the makings of a future Role 55, above-average everyday shortstop, with a Role 60, and some All-Star games, as his ceiling. It would be hard to see Rosario make his debut before rosters expand September 1, however, with his performance in Las Vegas, he’s making a strong push for a promotion sooner than that.