Nathan has a torn UCL and tendon in his right elbow, Bob Nightengale of USA Today reports. Nathan "felt a pop" in his elbow during what was supposed to be his only rehab assignment Wednesday, and his words afterwards didn't sound particularly encouraging. He's now scheduled for season-ending surgery, which may risk ending the career of the 40-year-old reliever. Detroit will turn to Joakim Soria at closer for the remainder of the season.