NEW YORK -- The Nationals tied a season high by hitting four home runs Tuesday night, and Doug Fister tossed seven shutout innings as Washington beat the New York Mets 7-1 at Citi Field.

The Nationals (64-53) increased their National League East lead over second-place Atlanta to a season-high five games. The Braves lost to the Los Angeles Dodgers, 4-2.

Washington beat the Mets for the ninth consecutive times at Citi Field dating back to June 30, 2013.

The Mets (57-63) were trying to move within four games of .500 for the first time since Aug. 2.

Left fielder Bryce Harper's two-run homer in the second provided the Nationals the only offense they would need. Washington added five runs in the sixth on a leadoff homer by third baseman Anthony Rendon and two-run shots by shortstop Ian Desmond and right fielder Michael Taylor. It was the first career homer for Taylor, who singled in his first major league at-bat in the second inning.

Second baseman Asdrubal Cabrera went 3-for-4, his first three-hit game since the Nationals acquired him from Cleveland on July 31. Harper, Taylor and catcher Wilson Ramos all had two hits apiece.

Fister (12-3) allowed seven hits, walked none and struck out three while beating the Mets for the second time in six days. On Tuesday, Fister held the Mets hitless in six at-bats with runners in scoring position.

The Mets loaded the bases with no outs in the eighth against left-hander Ross Detwiler but scored just one run on a sacrifice fly by pinch hitter Eric Campbell.

Second baseman Daniel Murphy, third baseman David Wright and shortstop Wilmer Flores all had two singles each for the Mets.

Mets right-hander Rafael Montero (0-3) gave up five runs on seven hits and two walks while striking out four over five innings. Montero was recalled from Triple-A Las Vegas on Monday to replace injured right-hander Jacob deGrom both on the roster and in the rotation.

Nationals center fielder Denard Span went 0-for-5. He reached base in each of his previous 36 games, the second-longest streak since the franchise moved to Washington in 2005.

NOTES: The game was delayed by rain for 25 minutes in the top of the third. ...Mets RHP Daisuke Matsuzaka (right elbow inflammation) began a rehab assignment Monday, when he threw three scoreless innings for Class A St. Lucie. He is expected to make one or two more starts for Class A Brooklyn. ... GM Sandy Alderson said the Mets might ask RHP Matt Harvey (Tommy John surgery) to limit his 2014 activity to bullpen sessions after fellow RHP Jeremy Hefner, who also underwent Tommy John surgery last year, re-tore his right elbow in a rehab start last Wednesday. ... Nationals RF Jayson Werth missed his fourth consecutive start due to a sore right shoulder. He was scheduled to undergo an MRI exam Tuesday. With Werth out, RF Michael Taylor made his major league debut and batted eighth.