Yankees right-hander Mark Prior is back pitching after missing almost three months because of a strained groin. The converted reliever said it was a step in the right direction Wednesday after allowing an unearned run and one hit over two innings for the Gulf Coast League Yankees against Atlanta minor leaguers. In his first outing since pitching on April 18 at Triple-A Scranton/Wilkes-Barre, Prior threw 24 pitches with a fastball that reached 90 mph.