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With his back right leg almost touching the dirt, Werth went low to launch his sixth homer of the season to put the Nationals up 4-1 in the fifth. Werth, who had not homered since May 14 at Arizona, singled with two outs in the ninth off Yusmeiro Petit to extend Washington’s lead to 6-2.

Drew Storen, Tyler Clippard and Jerry Blevins each tossed a scoreless inning to help Washington finish off San Francisco again. Closer Rafael Soriano had been warming up in the bullpen before Werth’s single.

“The best part about that is we could put the big scary guy back in his cage,” Werth said, “and save him for (Thursday).”

NOTES: The Nationals placed catcher Wilson Ramos on the 15-day disabled list with a strained right hamstring and called up catcher Sandy Leon from Triple-A Syracuse. … The Giants traded left-hander David Huff back to the Yankees for cash. He was sent to San Francisco in January for cash after the Yankees signed Masahiro Tanaka. … Tim Hudson (6-2, 1.97 ERA) takes the mound for the Giants opposite Washington’s Blake Treinen (0-2, 1.78 ERA) in Thursday’s series finale.