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