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Angelique Kerber of Germany hits a return during the single's quarterfinal match against Caroline Wozniaki of Denmark at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 16, 2018. Angelique Kerber lost 1-2. (Xinhua/Nikku)
Angelique Kerber of Germany hits a return during the single's quarterfinal match against Caroline Wozniaki of Denmark at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 16, 2018. Angelique Kerber lost 1-2. (Xinhua/Nikku)