Atlanta Braves starting pitcher Julio Teheran (49) throws during his game against the Washington Nationals at Nationals Park, Friday, April 12, 2013, in Washington. The Braves won 6-4.

WASHINGTON - Ramiro Pena hit a two-run homer off Craig Stammen with two outs in the 10th inning and the Atlanta Braves came back to beat the Washington Nationals 6-4 Friday night, stretching their winning streak to seven games.

Pena, who reached on a bunt as a pinch hitter in the eighth, helped Atlanta finish off a rally in a game it trailed 4-0 after two innings and 4-2 entering the ninth.

Eric O'Flaherty (2-0) pitched a 1-2-3 ninth for the win, while Craig Kimbrel retired the heart of Washington's order for his fifth save in five chances.

With one out in the 10th, Stammen (2-1) walked Dan Uggla. After a flyout, Pena hit his first homer of the season. The Braves, a major league-leading 9-1, handed Washington its first loss in seven home games.