In his seventh pro season, Corpas was added to the 40-man roster and finally advanced past the Class A level. Penciled into a middle relief role in Double-A to start the season, Corpas stepped in when closer Jim Miller was sidelined with strained left oblique muscle, and he dominated. He earned a brief promotion to Triple-A before joining the big league staff. Corpas, who pitched for Panama in the World Baseball Classic, enjoys the challenge of the later innings. His fastball registers 92-95 mph from a loose, whippy low three-quarters slot creating good movement. Corpas keeps hitters honest with his slider, and he'll throw it at any time in the count but has to stay on top of the ball from his release point to prevent it from flattening out. His changeup has improved, and he'll flash an effective one with late bottom-out action at the plate. After lefties hit .394 off him in 2005, he limited them to an .096 average in his Double-A stint, a promising sign that his changeup has made strides. Corpas' dominant effort should keep him in the mix to contribute in relief.
He has yet to spend a day above the Class A level, but Corpas received the Rockies' lone offseason promotion to the 40-man roster. His power fastball and strong finish in 2005 created fears that he could be targeted in the major league Rule 5 draft if left unprotected. Corpas regularly throws 95-97 mph from a low three-quarters slot. He has a tendency to get too low, slinging the ball at times. He creates better movement and sink on his fastball when he stays on top of the pitch. His second pitch, a slider, is more of a hard slurve. Corpas answered concerns about his command last year. He also did a good job of keeping the ball on the ground and in the park. His changeup is not a factor, which leaves Corpas destined for bullpen duty. If he can learn to repeat his arm slot and delivery, he has the potential to dominate in the late innings. He'll move up a level to Double-A.
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Rated Best Reliever in the Texas League in 2006
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