Giants 4, Dodgers 1: Buster Posey drove in two runs and Tim Lincecum pitched into the sixth inning as visiting San Francisco won its second straight over Los Angeles.

Lincecum (7-13) gave up one run over 5 2/3 innings to win his second consecutive start and help the Giants move 1 1/2 games ahead of the Dodgers atop the National League West.

Sergio Romo gave up a one-out single to Matt Kemp in the ninth before Javier Lopez induced Andre Ethier to ground into a game-ending double play for his third save.

After the Giants’ first three batters of the game reached base, Posey hit a two-run single off Joe Blanton (8-12), who remained winless in three starts since being traded to Los Angeles on Aug. 4.

San Francisco added to its lead in the fifth when Gregor Blanco scored on Brandon Crawford’s single. After moving to second on Lincecum’s sacrifice bunt, Crawford scored on Angel Pagan’s two-out double.

Los Angeles, which has scored two runs on 11 hits in the first two games of the series, plated its lone run when Kemp’s sacrifice fly scored Juan Rivera in the sixth.

Lincecum took a no-hitter into the fifth inning before Hanley Ramirez doubled with one out. He won for the first time in his last five starts at Chavez Ravine.

Pagan had three hits and Marco Scutaro added a pair for San Francisco, which improved to 60-2 when leading after eight innings.

GAME NOTEBOOK: The Dodgers optioned RHP Javy Guerra to Triple-A Albuquerque and activated RHP Rubby De La Rosa from the 60-day disabled list. … …The Giants improved to 4-2 since losing OF Melky Cabrera to a 50-game suspension. … The Dodgers fell to 6-11 at home since the All-Star break. …Lopez hasn’t given up an earned run in his last 17 appearances.