LeBron James nailed a game-winning shot at the buzzer and the Celtics needed overtime to stun the 76ers in NBA playoff action on Saturday. James banked in the winning jumper off the glass as the Cavaliers beat the Raptors 105-103 in Game Three from Cleveland. The Cavs now lead the series 3-0. The Celtics took advantage of some costly mistakes by the Sixers in overtime to steal a 101-98 Game Three win in Philly. Boston holds a 3-0 series lead.