De la Rosa has been on a steady climb through the Diamondbacks system since signing out of the Dominican Republic in 2008, posting a 2.48 ERA and 265 strikeouts in 243 innings. He conquered Double-A last season, earning a spot on Arizona's 40-man roster and a Triple-A assignment for 2013. De la Rosa pitches with a deceptively funky delivery, coming at the batter from an extreme angle on the first-base side with a variety of arm angles between sidearm and low three-quarters. He mixes four pitches, with the best being his low-90s fastball and his effective slider. He also throws a curveball and changeup. While he's toughest on lefthanders and profiles as a lefty specialist, de la Rosa has been effective against righthanders throughout his career. His fastball gets in on righties, who batted just .225 against him last season. Despite his small stature, he's durable and a tough competitor.
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