ARLINGTON, Texas (AP) Kansas City Royals starter Danny Duffy has been diagnosed with a torn ulnar collateral ligament in his left elbow.
Duffy was put on the 15-day disabled list Monday, when an MRI revealed the injury.
Right-hander Nate Adcock was recalled from Triple-A Omaha.
The Royals said Duffy is expected to get a second opinion on his elbow from Dr. Lewis Yocum in Los Angeles.
Duffy (2-2) faced only three batters in the first inning of his start Sunday against the Chicago White Sox. After catcher Humberto Quintero saw the left-hander shake his arm after a throw, manager Ned Yost and a trainer visited the mound. Yost immediately made a change when Duffy said his elbow was the problem.
The 23-year-old Duffy also experienced tightness in his elbow last month.