Novak Djokovic double-faulted, shook his right arm and grimaced. Seconds later Monday night, a weak serve produced a wince, then was followed by a missed forehand that gave away a set in the defending champion’s first-round U.S. Open match.
While he managed to finish a 6-3, 5-7, 6-2, 6-1 victory over Jerzy Janowicz of Poland, there were signs of trouble, starting with a visit from a trainer who massaged Djokovic's arm after only five games.
Asked about his health during an on-court interview, Djokovic deflected the question, saying, “I don't think it's necessary to talk about this now. I'm through. I'm taking it day by day.”