Karolina Pliskova returns a shot during the women's singles quarterfinal match between Hsieh Su-wei of Chinese Taipei and Karolina Pliskova of the Czech Republic at Dubai Duty Free Tennis WTA Championships 2019 in Dubai, the United Arab Emirates, Feb. 21, 2019. Hsieh Su-wei won 2-1 to proceed to the semifinals. (Xinhua/Mahmoud Khaled)