Duffy has been reinstated from the 15-day DL ahead of his start Wednesday against the Mariners. Duffy struggled in his last three starts before landing on the DL as his ERA ballooned from 3.45 to 5.87. In his last start with the Royals on May 16, Duffy allowed four earned runs over five innings with three strikeouts. The Royals optioned right-hander Michael Mariot to clear room for Duffy, who will be pitching at Safeco Field against Roenis Elias and the Mariners.