The Orioles lost two relievers in the 2010 major league Rule 5 draft--Pat Egan and Pedro Beato--but think they found a pitcher with more upside when they took Rosario from the Brewers. He hasn't played above low Class A, so it will be a challenge for him to stick in the big leagues. Rosario has a low-90s fastball and backs it up with a plus changeup that falls off the table. That's what gets scouts interested, but it's also about all he has at this point. He lacks a reliable breaking ball and struggles with the command of all of his pitches. He needs to become more confident and aggressive on the mound. At some point he could become a major league set-up man, but not this year. The Orioles will have to stash Rosario as the 25th man on their roster and use him sparingly. If they can't keep him on the major league roster, he'll have to clear waivers and be offered back to Milwaukee.
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