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HOUSTON (AP) - Adam LaRoche hit a tying double in the eighth inning and a go-ahead single in the ninth Tuesday night that lifted the Washington Nationals over the Houston Astros 4-3.

Jayson Werth homered as the Nationals won the opener of the interleague series.

Denard Span drew a leadoff walk in the ninth, stole second base and advanced to third on a groundout. He scored on LaRoche's hit to right field off Josh Fields (0-3).

Tyler Clippard (2-2) pitched a scoreless eighth for the win. Rafael Soriano walked two in a scoreless ninth for his fifth save.

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