Serrano's career started slowly after he signed out of Venezuela at age 17. He spent four seasons in short-season ball before reaching Double-A in 2001. He has been used primarily as a reliever, and his future lies as a short man out of the pen. Serrano consistently pumps 92-94 mph fastballs with late, heavy sink. He throws a fringe-average slider with occasional sharp bite, and is trying to develop an effective changeup from a high three-quarters release. Serrano will drop down and vary his arm slot, but being consistent with his delivery has been the key to his turnaround. He has a Jose Mesa-type body and his weight is a concern. Serrano is one of several relief prospect the Phillies are monitoring closely, along with righthanders Franklin Nunez, Doug Nickle, Jesus Cordero, Cary Hiles and Geoff Geary, and lefthander Pete Zamora.
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