WORLD number one Novak Djokovic suffered his second defeat at the Rio Olympics after the Serbian and partner Nenad Zimonjic were beaten in straight sets by Brazilian pair Bruno Soares and Marcelo Melo.

Djokovic was back in action the day after he left the Olympic Tennis Centre in tears following his defeat to Juan Martin Del Potro in the singles, a loss he described as "one of the toughest" of his life as his wait for an elusive Olympic gold medal continues.

The opportunity to win one in the men's doubles alongside Zimonjic went begging too, after the duo were brushed aside 6-4 6-4 in the second round by the home favourites, seeded third, inside 73 minutes.