Perfect Game - Fred Bowen Sports Story Series 1st edition

Isaac is a serious pitcher. He's got an awesome fastball and sneaky changeup. He's determined to pitch a perfect game: no hits, no runs, no walks, and no errors. He gets close a couple of times, but when the batter gets on base, Isaac totally loses his cool on the mound and can't get his head back in the game. Then Isaac learns about a Special Olympics Unified Sports team and meets an interesting athlete who shows him a whole new way to think about perfect.