Jason Marquis pitched a five-hitter to beat Tim Lincecum, and reserve outfielder Laynce Nix made the most of a rare start by connecting for a two-run homer that carried the Washington Nationals to a 3-0 victory over the San Francisco Giants on Friday night. Marquis (3-0) struck out seven and walked none in his fourth major league shutout and first since 2009 with Colorado.