WASHINGTON — Bryce Harper did it again, extending his remarkable homer streak with a two-run shot in the bottom of the ninth inning that sent the Washington Nationals over the Atlanta Braves 8-6 Saturday. Harper homered for the sixth time in his last three games, one off the major league record set by Shawn Green in 2002. At 22, Harper had already become the youngest player in big league history to hit five home runs in two games.