Zack Greinke walked off the mound at Kauffman Stadium in the fourth inning Wednesday, acknowledging the ovation from a sparse late-September crowd, and then watched Royals reliever Angel Zerpa completely befuddle the Guardians the rest of the way in a 6-2 victory that wrapped up a three-game series sweep. If it was Greinke's last start for Kansas City, it certainly was memorable.