Novak Djokovic and Nenad Zimonjic beaten in men's doubles

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Novak Djokovic suffered another Olympics defeat as he and 40-year-old team-mate Nenad Zimonjic exited the men's doubles in round two.

The Serbs lost 6-4 6-4 to Brazilians Marcelo Melo and Bruno Soares in Rio.

The loss came a day after Djokovic was knocked out of the singles by Argentine Juan Martin del Potro.

World number one Djokovic, 29, suffered a surprise third-round defeat at Wimbledon in July when he lost to American Sam Querrey.

The 12-time Grand Slam winner came back to claim his 30th Masters title in Toronto before the Olympics.

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