Heather Watson of Britain celebrates during the women's singles first round match against Samantha Stosur of Australia at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 17, 2017. Watson won 2-1. (Xinhua/Bai Xue)
Novak Djokovic of Serbia celebrates after winning the men's singles first round match against Fernando Verdasco of Spain at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 17, 2017. Djokovic won 3-0. (Xinhua/Bai Xue)