PARIS >> If the upcoming French Open showdown between Serena Williams and Maria Sharapova provides any of the sort of animus and back-and-forth they manage to stir up away from the court, look out.During a news conference after both won Saturday to set up the longtime rivals' fourth-round matchup at Roland Garros, Williams criticized Sharapova's autobiography as "hearsay" and twice brought up the Russian's 15-month doping ban.