There are closers in baseball, then there are stoppers.Zack Greinke has pretty much established himself as a genuine stopper since joining the Dodgers' rotation last season, usually following a Dodger defeat with a much-needed victory.Boy, was Greinke needed Saturday.Greinke delivered seven quality innings and the Dodgers received an electrifying jolt offensively from Dee Gordon to rally for a 6-2 victory over the arch-rival San Francisco Giants at Dodger Stadium.