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WASHINGTON (AP) - Pinch-hitter Scott Hairston's sacrifice fly with one out in the 11th inning scored Jayson Werth to give the Washington Nationals a 6-5 victory over the Pittsburgh Pirates on Sunday night and complete a three-game sweep.

Werth, who had missed the last five games with a bothersome shoulder, entered the game as a pinch-hitter in the ninth and doubled leading off the 11th against Brandon Cumpton (3-4).

Werth went to third on Denard Span's grounder to first. Hairston then sent Cumpton's first pitch to deep left and Werth scored easily after the catch.

Ross Detwiler (2-2) pitched two innings for the win.

Span and Anthony Rendon had two hits each for National League East-leading Washington, which has won six straight.

The Pirates have lost five straight for the first time since September 2012.

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