Highlights of 2019 Australian Open day 11

Petra Kvitova of the Czech Republic serves during the women's singles semifinal match between Petra Kvitova of the Czech Republic and Danielle Collins of the United States at the 2019 Australian Open in Melbourne, Australia, on Jan. 24, 2019. Kvitova won 2-0 to enter the final. (Xinhua/Bai Xuefei)