Wang (4-3) allowed only one run, surrendering four hits while issuing no walks and striking out four for the Nationals.
Danny Espinoza's two-run single in the fourth put the Nats ahead 3-0 and he came around to score on Wang's base hit.
Brandon Beachy (7-3) was touched for four runs on five hits on a six-inning start for the National League wild card-leading Braves, who saw their lead over St. Louis dwindle to two games with four contests remaining.
Video of Victoria’s Secret models trying to 'twerk' hits Instagram
Costly malfunction causes beer flood at Boston-area brewery