Rival AZL managers and scouts who saw Concepcion early in the season weren't impressed with his inconsistent delivery, but he made tremendous strides during the course of the summer. "I tried to simplify his mechanics a little bit," said Giants pitching coach Mike Caldwell. "He's got a lot of arm swing. His mechanics are getting better with a more consistent release point." Concepcion struck out 70 batters in 55 innings, mainly relying on a mid-90s fastball that touches 98. Caldwell believes that Concepcion eventually will reach 100 mph with his heater. His second-best pitch is a curveball that needs tighter spin, and he's also working on a changeup. Concepcion spent three years in the Dominican Summer League before coming to the United States. Now 20, he'll need to start moving quickly. While Caldwell projects him as a starter, Concepcion drew an Armando Benitez comparison as a potential power reliever.
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