Kansas City Royals pitcher Zack Greinke did something he hadn’t done in a while against the Oakland Athletics. Greinke entered as a reliever in his first game back from the 15-day injured list. Greinke, who missed his last two starts due to rightelbow soreness, pitched four innings against the A’s. He relieved starter Angel Zerpa in the fourth inning. Zerpa allowed five runs (four earned) in…