
LONDON, July 2, 2016 (Xinhua) -- Novak Djokovic of Serbia falls down during the men's singles third round match against Sam Querrey of the United States at the Wimbledon Tennis Championships in London, Britain, on July 1, 2016. (Xinhua/Han Yan)

LONDON, July 2, 2016 (Xinhua) -- Novak Djokovic of Serbia falls down during the men's singles third round match against Sam Querrey of the United States at the Wimbledon Tennis Championships in London, Britain, on July 1, 2016. (Xinhua/Han Yan)