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The son of former big league closer Troy Percival kept sprouting in high school, from 6-foot-2 as a sophomore to 6-foot-4 as a junior to 6-foot-6 as a senior. Once he stopped growing he finally gained some command, drawing attention from evaluators. Percival is long-limbed and high-waisted in his thin, projectable frame and throws his fastball 88-90 mph downhill with ease. His top secondary is a potentially plus changeup he throws with the same arm speed and draws foolish swings from polished hitters. He shows potential to spin an average curveball but is still learning to master the pitch. Percival's bloodlines, body, stuff and improved command have evaluators' interest piqued, but he is committed to play for his dad at UC Riverside and widely expected to honor that commitment.