Logan Ondrusek made the biggest jump from suspect to prospect of any Reds pitcher in 2009, with del Rosario right on his heels. The Reds altered his arm slot during spring training and the results were immediate and dramatic. Like Ondrusek, del Rosario jumped from high Class A to Triple-A and was added to the 40-man roster after the season. Signed out of the Dominican Republic as a 19-year-old in 2005, he didn't even make it to the United States until 2007 and didn't pitch in a full-season league until he was 22. He was at best a rosterfiller with good command of an 87-89 mph fastball. But once he started pitching from a lower arm slot last season, del Rosario was able to generate increased velocity (90-92 mph, touching 93) with newfound sink. When he's on, as he was for most of 2009, his sinker generates plenty of grounders and broken bats. He also throws a slider and a changeup, but mainly relies on his sinker. Projecting as a setup man, del Rosario figures to open this season back in Triple-A
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