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SAN FRANCISCO (AP) - Jayson Werth hit his first homer in almost a month and drove in three runs, and the Washington Nationals capitalized on Matt Cain's erratic start to beat the San Francisco Giants 6-2 on Wednesday night for their fourth straight win.

Cain (1-4) walked the first three batters he faced before Adam LaRoche's two-run single highlighted a three-run first inning. Werth's solo shot in the fifth and two-run single in the ninth provided the rest of the pop for the Nationals, who have won 10 of 12, including the last three at San Francisco.

Tanner Roark (5-4) allowed two runs and seven hits in six-plus innings for Washington. He struck out four and walked none.

Brandon Crawford and Pablo Sandoval each drove in a run for the Giants, who have lost a season-high tying three straight.

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