tennis May 10, 2024 3:34 pm Novak Djokovic struck in head by metal water bottle Watch the moment tennis star Novak Djokovic was struck in the head with a metal water bottle while signing autographs. US & World Videos 2:08 What color are tennis balls? 1:09 What is a ‘Golden Slam' in tennis? 0:46 Djokovic finally gets his Olympic gold medal 1:43 Team USA's Austin Krajicek secures silver in men's double tennis 2:57 US tennis stars on winning silver medals at men's doubles: ‘Experiences we'll never forget'