In pics: Day 1 of 2019 Australian Open

Angelique Kerber of Germany hits a return during women's single's first round match between Angelique Kerber of Germany and Polona Hercog of Slovenia at the 2019 Australian Open in Melbourne, Australia, Jan. 14, 2019. Angelique Kerber won 2-0. (Xinhua/Lui Siu Wai)