BP highlighted both in their recent ten pack.
Rosario entered the season firmly entrenched in a deep Minnesota system and his upward trajectory carried him to the no. 60 spot in our Top 101. I caught him after his promotion to the Eastern League last season and the feel for hitting, along with some legit thunder in his stick, stuck out. There was some swing-and-miss to his game, but the 22-year-old was confidently turning around fastballs with authority and attacking offerings with a fluid stroke that unfolds with some leverage. A 50-game suspension for a banned substance started this year off on the wrong foot and delayed what looked to be merely a brief follow-up in Double-A before a promotion. When I’ve seen Rosario this season, though, it’s been apparent that there is a need for major adjustments to his approach and mindset as a hitter. His strike zone selection has been poor, compounded by his thinking he’s a power guy instead of a gap-to-gap hitter who can muscle up in spots. Neglecting to cover the outer third of the plate has led to a lot of weak roll-overs, popups, and lazy fly balls. The defense is far from a carrying tool, so with his bat’s progression stalling, so have Rosario's major-league prospects. Failure can stimulate, and Rosario certainly has offensive talent. With adjustments, Rosario can quickly get back on track, but it’s going to come down to the recognition and commitment to do so. —Chris Mellen
Max Kepler, OF, Twins (High-A Fort Myers)
Kepler looks the part. If you were designing a ballplayer, Kepler could be the mold. At 6-foot-4 and well-built but not oversized, Kepler could sell jeans, as the old story goes. The swing looks as good as the build, starting with a lightly open, traditional left-handed stance, continuing with a slight uppercut and above-average bat speed, and ending with a nice, two-handed finish. Despite looking the part, Kepler simply doesn't square the ball up consistently, and when he does, he doesn't do so with the authority expected from a player his size. He doesn't swing and miss a ton and has a decent eye with a sound approach, but he feels for the ball (especially against left-handed pitching) and does not drive it. Kepler therefore fails to project as a regular. He's already limited to corner outfield positions and first base, which raises the bar even higher, but right now, he's nowhere close to displaying the power necessary to live up to the expectations of his defensive position. The profile is there for more, and he's still just 21, so it's far from a lost cause, but we've yet to see any kind of power production outside of the Appalachian League two years ago and there are few signs this year that he's turning the corner. —Jeff Moore