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