LOS ANGELES—The Arizona Diamondbacks gave Manny Ramirez three chances to hurt them Saturday. He came through twice, and that was enough for the streaking Los Angeles Dodgers.

Ramirez hit a three-run homer in the fifth inning to break a scoreless tie and added a two-run double in the sixth, helping the Dodgers beat Brandon Webb and the Diamondbacks 7-2 to take over sole possession of first place in the NL West for the first time since April 4.

Chad Billingsley took a shutout into the seventh for Los Angeles. By winning their seventh straight after an eight-game skid, the...

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