Rio 2016: Novak Djokovic in tears following shock defeat to Juan Martin Del Potro

Djokovic left the court in tears after his defeat 

Novak Djokovic admitted his shock first round defeat to Juan Martin Del Potro was "one of the toughest losses in my life" as his hopes of claiming an elusive Olympic gold in the men's singles went up in smoke in Rio.
Djokovic, who also lost to Del Potro in the bronze medal play-off at London 2012, had no answer to the power of the Argentinian, with the 2009 US Open champion sealing a 7-6 (7/4) 7-6 (7/2) victory in almost two and a half hours.
The 27-year-old, who has dropped to 141st in the world after almost two years out with wrist problems, did not face a single break point on his serve and hammered 29 forehand winners past a helpless Djokovic.