Daria Kasatkina of Russia serves during the women's singles 2nd round match against Angelique Kerber of Germany at WTA Qatar Open 2017 at the International Khalifa Tennis Complex of Doha, Qatar, Feb. 16, 2017.(Xinhua/Nikku)
Daria Kasatkina of Russia serves during the women's singles 2nd round match against Angelique Kerber of Germany at WTA Qatar Open 2017 at the International Khalifa Tennis Complex of Doha, Qatar, Feb. 16, 2017.(Xinhua/Nikku)