Video PlayerClose

Dominic Thiem of Austria hits a return to Alex Bolt of Australia during their men's singles second round match at the Australian Open tennis championship in Melbourne, Australia on Jan. 23, 2020. (Xinhua/Bai Xuefei)

Dominic Thiem of Austria hits a return to Alex Bolt of Australia during their men's singles second round match at the Australian Open tennis championship in Melbourne, Australia on Jan. 23, 2020. (Xinhua/Bai Xuefei)