Castillo didn't sign with the Giants until he was 19, but he's moved relatively quickly since then. He can dominate at times with a 93-96 mph fastball and a hard, low-80s curveball that flashes average. Castillo's delivery is not well-balanced. It's a high-effort delivery that finishes with him spinning toward first base, which explains why he sometimes finds the strike zone jumping around on him. He is reasonably athletic and has some present strength, so the Giants hope he can refine his delivery. He's ready to move up to high Class A San Jose as a power reliever, with a chance to eventually be a setup man.
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