Royals | Kelvin Herrera working on curve
Kansas City Royals RP Kelvin Herrera is making it a point to improve his curveball this spring. "I want to be able to mix that in more with my other pitches," he said. "I want to throw it more often. I want to gain enough confidence in my breaking ball to do that. I've been throwing it a lot (in practice), and I feel good about it."
2013-03-01 16:56:14 | Source: The Kansas City Star - Bob Dutton
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