Angelique Kerber of Germany serves during the women's singles second round match against her compatriot Carina Witthoeft at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 18, 2017. Kerber won 2-1. (Xinhua/Lui Siu Wai)
Angelique Kerber of Germany serves during the women's singles second round match against her compatriot Carina Witthoeft at the Australian Open Tennis Championships in Melbourne, Australia, Jan. 18, 2017. Kerber won 2-1. (Xinhua/Lui Siu Wai)