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Angelique Kerber of Germany reacts 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 reacts 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)