Daria Kasatkina of Russia returns the ball during the women's singles quarterfinal match against Monica Puig of Puerto Rico at WTA Qatar Open 2017 at the International Khalifa Tennis Complex of Doha, Qatar, Feb. 17, 2017. (Xinhua/Nikku)
Daria Kasatkina of Russia returns the ball during the women's singles quarterfinal match against Monica Puig of Puerto Rico at WTA Qatar Open 2017 at the International Khalifa Tennis Complex of Doha, Qatar, Feb. 17, 2017. (Xinhua/Nikku)