Washington's Ryan Zimmerman clubbed a 2-run homer to ignite a 6-run rally in the 6th inning and take 2 of 3 in the series.
Felipe Lopez homered and reached base four times for Washington.
The Brewers still hold a 4 1/2 game lead on the Cubs in the Central because Chicago lost yesterday at Pittsburgh. The Brewers finished 3-7 on their road trip.
The All-Star game is Tuesday and four Brewers, Prince Fielder, Ben Sheets, J.J. Hardy and Francisco Cordero will all take part. Fielder gets a head start tonight as he participates in the All-Star Home Run derby.