Novak Djokovic of Serbia has his elbow tended to after falling while trying to return a shot from Federer...
Novak Djokovic of Serbia has his elbow tended to after falling while trying to return a shot from Roger Federer of Switzerland in the first set during their men's singles final match at the U.S. Open Championships tennis tournament in New York, September 13, 2015. REUTERS/Carlo Allegri