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