Greinke, Bumgarner set for clash of aces
(MLB.com Arizona Diamondbacks)

Two pitchers with All-Star credentials will battle Saturday at AT&T Park. D-backs right-hander Zack Greinke, who owns a 2.03 ERA over his last four starts, will go against Giants lefty Madison Bumgarner, who is looking to get back on track after a few rough starts.