Whether its Batter up! or Curtain Up!, Frank Sinatra and Gene Kelly are ready when they play early-1900s vaudevillians who spend the winter flinging the on-stage blarney and the summer flinging the ol horsehide for baseball’s defending world champs, The Wolves.Sinatra is a second sacker Dennis Ryan and Kelly is shortstop Eddie O’Brien in this Busby Berkeley-directed romp that combines a baseball storyline with that other all-American pastime: romance. Esther Williams plays the new team owner thrust into this pack of baseball Wolves.