In pics: Day 1 of 2019 Australian Open

Caroline Wozniacki of Denmark hits a return during women's single's first round match between Caroline Wozniacki of Denmark and Alison van Uytvanck of Belgium at the 2019 Australian Open in Melbourne, Australia, Jan. 14, 2019. Caroline Wozniacki won 2-0. (Xinhua/Lui Siu Wai)