Buster Posey hit a tiebreaking two-run homer in the eighth inning and the San Francisco Giants won for the eighth time in 10 games by beating the New York Mets 4-2 on Friday night.San Francisco Giants' Brandon Hicks, right, slides ahead of the ball to score past New York Mets catcher Travis d'Arnaud in the fifth inning of a baseball game Friday, June 6, 2014, in San Francisco. Hicks scored on a sacrifice fly by Brandon Crawford.San Francisco Giants' Matt Cain works against the New York Mets in the first inning of a baseball game Friday, June 6, 2014, in San Francisco.New York Mets' Daniel Murphy swings for a two-run home run off San Francisco Giants' Matt Cain in the seventh inning of a baseball game Friday, June 6, 2014, in San Francisco.San Francisco Giants left fielder Juan Perez catches a ball hit by New York Mets' Andrew Brown in the second inning of a baseball game Friday, June 6, 2014, in San Francisco.