The NL East-leading Nationals have won nine straight games in the season series with the Braves — including a three-game sweep at Washington last week.
Zimmermann (6-5) ended a streak of three losses since his last win on June 2. He earned a no-decision despite throwing eight scoreless innings against Atlanta on Wednesday. He continued that dominance in his second straight start against the Braves, allowing six hits with no walks and six strikeouts in 7 2-3 innings.
Clint Robinson hit a two-run homer to cap Washington's four-run first inning off Shelby Miller (5-4).
