After a harmless groundout in the fourth inning Sunday against Kansas City, Shelley Duncan made a minor adjustment to his swing at the suggestion of Cleveland hitting coach Bruce Fields. There was nothing harmless about Duncan's next two trips to the plate. He pounded a three-run homer into the gusting wind in the sixth inning, and then added a two-run shot in the eighth as Cleveland built a big lead. Duncan's career-high five RBIs helped the Indians beat the pesky Royals 9-6 and set up a critical three-game series starting Monday against Detroit.