WASHINGTON, May 19 (UPI) -- Brandon Moss had three RBI, including the winner, in the 10th inning Tuesday to lead Pittsburgh to an 8-5 victory over Washington.
Adam and Andy LaRoche each drove in two runs for the Pirates, who have won four straight.
Tom Gorzelanny (1-0) pitched 1 1/3 scoreless innings in relief for the win. Pittsburgh starter Jeff Karstens allowed four runs on seven hits in six innings.
Joe Beimel (0-3) was charged with the loss after allowing three runs on three hits in two relief innings.