Michael Conforto's two-run single highlighted a four-run 10th inning and the San Francisco Giants beat the Washington Nationals 9-5 on Thursday after squandering a three-run lead in the ninth inning. Mike Yastrzemski grounded up the middle leading off the tenth against Robert Garcia (2-4). On the play, shortstop CJ Abrams threw wide to third attempting to get designated runner Jerar Encarnacion and both runners were safe.