Petra Kvitova returns a shot during the women's singles quarterfinal match between Petra Kvitova of the Czech Republic and Viktoria Kuzmova of Slovakia at Dubai Duty Free Tennis WTA Championships 2019 in Dubai, the United Arab Emirates, Feb. 21, 2019. Petra Kvitova won 2-0 to proceed to the semifinals. (Xinhua/Mahmoud Khaled)