Xinhua sports photo of the day

Karolina Pliskova serves during the women's singles quarterfinal match between Serena Williams of the United States and Karolina Pliskova of the Czech Republic at the 2019 Australian Open in Melbourne, Australia, on Jan. 23, 2019. Karolina Pliskova won 2-1. (Xinhua/Bai Xuefei)