Rio Olympics: Novak Djokovic's campaign comes to an end, suffers shock defeat to old nemesis Juan Martin del Potro

New Delhi: Olympics singles medal remains a dream Novak Djokovic as the world number one was knocked out of men's singles competition by Juan Martin del Potro at 2016 Rio Games on Monday.

The Serbian great lost his first round match in straight sets, 7-6 (4), 7-6 (2), in the biggest upset in the tennis tournament at 2016 Games.

Incidentally, he also lost to the towering Argentine in the bronze medal match at the London Olympics.

Del Potro, former US Open champion ranked 145 in the world after an injury-hit few years, stunned the Serb with power tennis, coupled with unplyable serves.