WASHINGTON (AP) -- Starlin Castro hit a run-scoring double in the eighth inning to break a scoreless tie and Aramis Ramirez hit a two-run homer to lift the Chicago Cubs to a 4-0 win over the Washington Nationals on Wednesday night.
Ryan Dempster (12-8) threw seven scoreless innings, allowing two hits and striking out eight.
Washington's Jason Marquis (0-7) remained winless this season despite his best pitching performance of the year. He gave up one run on four hits in 7 1-3 innings, walking three and striking out two.
Alfonso Soriano led off the ninth inning with a home run to left-center field, his 21st homer of the season.
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