Angelique Kerber of Germany returns the ball during the women's singles match against Dominika Cibulkova of Slovakia at the WTA finals tennis tournament in Singapore, Oct. 23, 2016. Kerber won 2-1. (Xinhua/Then Chih Wey)
Angelique Kerber of Germany returns the ball during the women's singles match against Dominika Cibulkova of Slovakia at the WTA finals tennis tournament in Singapore, Oct. 23, 2016. Kerber won 2-1. (Xinhua/Then Chih Wey)
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