Medlen has yet to pitch for Kansas City after undergoing his second Tommy John surgery last year. The Royals signed him knowing that he would be available for the second half this season if all went well, and so far the right-hander is right on schedule.
Duffy went on the disabled list with biceps tendinitis after the left-hander experience a series of wild outings. He said that a slight tweak to his delivery has helped him throw more strikes.
Medlen will head back to Arizona for more work at the Royals spring complex. Duffy will throw a side session Saturday and then likely head out for a rehab assignment.