Highlights of 2019 Wimbledon Tennis Championships day 7

(190709) -- LONDON, July 9, 2019 (Xinhua) -- Novak Djokovic falls down on the grass during the men's singles fourth round match between Novak Djokovic of Serbia and Ugo Humbert of France at the 2019 Wimbledon Tennis Championships in London, Britain, on July 8, 2019. (Xinhua/Han Yan)