Jason Heyward belted two home runs, including a game-tying two-run home run off Nationals closer Rafael Soriano in the bottom of the ninth, to stay red-hot for the Braves.
Stephen Strasburg, who started on the mound for the Nationals, was ejected in the second inning after throwing two pitches behind Atlanta shortstop Andrelton Simmons. Washington skipper Davey Johnson was also ejected in the inning.
Strasburg and the Nationals received warnings from home plate umpire Marvin Hudson after Justin Upton was hit by a pitch in the first inning.
Tensions were high coming into tonight's game following last night in which Nationals slugger Bryce Harper was hit by pitches twice.
Freddie Freeman and Brian McCann both homered tonight for the Braves but starting pitcher Mike Minor was not sharp, giving up four runs on four hits and walking four in 1.2 innings.
The Braves bullpen allowed three more runs over the next 7.1 innings and held the Nationals scoreless in extras until LaRoche's home run in the 15th.
Jayson Werth and Wilson Ramos each had two hits and two runs batted in to pace Washington's offense.
With the win, the Nationals gain a game on the Braves, who currently lead the National League East by 14.5 games.
The Braves complete the weekend series with the Nationals tomorrow afternoon at 1:35. Atlanta will send Julio Teheran (9-6, 3.08) to the mound to face Washington starter Gio Gonzalez (7-5, 3.42) in the rubber match.
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