A day after one of their worst offensive games of the season, the San Francisco Giants had their best. Angel Pagan hit a grand slam during a seven-run fourth inning, Johnny Cueto shut down Pittsburgh into the seventh and the Giants clobbered the Pirates 15-4 on Tuesday night. Conor Gillaspie also homered during the fourth among his four hits and Gregor Blanco scored three times for San Francisco, which won a night after having an eight-game winning streak snapped in a 1-0 loss to Pittsburgh.