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Angelique Kerber of Germany attends a press conference ahead of the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 11, 2018. (Xinhua/Nikku)

Angelique Kerber of Germany attends a press conference ahead of the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 11, 2018. (Xinhua/Nikku)