Whether it's luck that comes from a puck ricocheting off a defender's pads, the end boards and the goalie's skate for one goal or a sterling pass that led to another, the Sharks seem to have a hex over the Washington Capitals in San Jose. Patrick Marleau scored the tiebreaking goal early in the third period off a nifty, no-look pass from Joe Thornton and the Sharks got goals from three defensemen to beat the Capitals 5-2 Saturday night, extending their home unbeaten streak over Washington to 12 games.