
For the third straight night, the Nats bullpen blew a late lead, when Matt Grace allowed a two-out RBI single to Kolten Wong that tied the game at 3-3.
Max Scherzer had been in line for the win, but ended up getting a no-decision after allowing two runs on 11 hits in six innings, striking out 10 without allowing a walk.
Zimmerman had a monster night at the plate for the Nationals, hitting two homers, his 15th and 16th of the season, in addition to his game-winner.
Jayson Werth (6) also homered for Washington (67-65), which kept pace six and a half games back of the New York Mets in the National League East.