Justin Upton and Andrelton Simmons homered and the Atlanta Braves won their ninth in row as Paul Maholm beat the Washington Nationals 9-0 Sunday to complete a three-game sweep.

Upton hit his seventh home run of the season. Chris Johnson had four hits and two RBI for the Braves, who took a 7-0 lead in the third inning against Gio Gonzalez (1-1).

In sweeping their NL East rivals and compiling the best record in the major leagues, Atlanta (11-1) has outscored the opposition 62-23 and built a 20-6 advantage in home runs.

The Braves have swept three straight series (Cubs, Miami and Washington) for the first time since April 2000, when they swept four in a row (Phillies, Pirates, Dodgers, and Padres).

Washington has lost seven straight to Atlanta, dating back to last year.

Maholm (3-0) allowed four hits in 7 2/3 innings, walking one and striking out seven. The left-hander has not surrendered a run this season in 20 1/3 innings over three starts.

After giving up two singles in the eighth, Maholm was replaced by Luis Avilan, who walked Bryce Harper to load the bases before retiring Ryan Zimmerman on a comebacker.

Gonzalez yielded seven runs and seven hits in five innings for the defending division champion Nationals.

Gonzalez came in with an 0.82 ERA in two starts, but he struggled from the outset in this one.