A catcher most of his prep career, Castro entered this season thought of as a bat first after his strong summer in the Cape Cod League. He hit just .263 combined in his first two seasons at Stanford, then hit .341 in the Cape (second-best in the league), but he played mostly first base or outfield in deference to Florida State's Buster Posey. This spring, Castro has put it all together, showing he can hit for average and power while being Stanford's primary catcher. At 6-foot-3, he's tall but athletic enough to have good lateral movement and agility, and he's improved as a receiver, where he's considered fringe-average at worst. His arm also grades as average, and he's an above-average hitter, particularly for his position. Offensively, Castro stays inside the ball and has a fundamentally sound, strong swing. One scout likened his offensive package to that of former Athletics supplemental first-rounder Mark Teahen, who also played collegiately in the Bay Area, only with more power. In some years, Castro would be the best catcher on the board, but this he's third behind Posey and Southern California prep phenom Kyle Skipworth. He's not expected to last past the first round.