A 27-year-old who spent the majority of 2012 toiling in Triple-A for the Miami Marlins, Rosario put together a pretty good campaign in the minors. The right-hander yielded just three runs in 26 innings with New Orleans of the Pacific Coast league, converting 16 saves in the process.
Rosario was claimed via waivers by the Red Sox on Oct. 17 before being designated for assignment on Nov. 20. He is currently with Gigantes del Cibao of the Dominican Winter League, and has appeared in 10 games. Last season, he appeared in four games for the Marlins, yielding eight hits and six earned runs in three innings.
Photo via Twitter/McCarthy Supporters