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WASHINGTON (AP) - Anthony Rendon homered to spark a three-run seventh inning, and pinch-hitter Nate McLouth came through with a tiebreaking sacrifice fly as the Washington Nationals rallied past the Houston Astros 6-5 Wednesday night for a two-game sweep.

Washington extended its NL East lead to 1 1/2 games over Atlanta and Miami. The Nationals open a four-game series against the Braves on Thursday night in Washington.

Rendon led off the seventh against Josh Zeid with his 10th home run, cutting the deficit to 5-4.

Jayson Werth walked and went to third on Adam LaRoche's single off Darin Downs (1-1). Kyle Farnsworth came on to face Ryan Zimmerman, who grounded into a fielder's choice, beating the relay to first as Werth scored to tie it.

Ian Desmond then doubled Zimmerman to third. After Danny Espinosa was intentionally walked, McLouth's long fly to left field scored Zimmerman with the go-ahead run.

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