China's Qiang Wang celebrates winning the match against Serena Williams of the U.S. in Australian Open Third Round at Melbourne Park, Melbourne, Australia, January 24, 2020. Serena Williams suffered a dramatic exit from the Australian Open on Friday, her earliest in 14 years, falling 6-4 6-7(2) 7-5 to China's Wang Qiang. REUTERS/Kai Pfaffenbach

China's Qiang Wang in action during the match against Serena Williams of the U.S. in Australian Open Third Round at Melbourne Park, Melbourne, Australia, January 24, 2020. REUTERS/Kai Pfaffenbach

China's Qiang Wang in action during the match against Serena Williams of the U.S. in Australian Open Third Round at Melbourne Park, Melbourne, Australia, January 24, 2020. REUTERS/Kai Pfaffenbach

Tennis - Australian Open - Third Round - Melbourne Park, Melbourne, Australia - January 24, 2020 China's Qiang Wang in action during the match against Serena Williams of the U.S. REUTERS/Kai Pfaffenbach

China's Qiang Wang in action during the match against Serena Williams of the U.S. in Australian Open Third Round at Melbourne Park, Melbourne, Australia, January 24, 2020. REUTERS/Kai Pfaffenbach

China's Qiang Wang celebrates during the match against Serena Williams of the U.S. in Australian Open Third Round at Melbourne Park, Melbourne, Australia, January 24, 2020. REUTERS/Kai Pfaffenbach