Angelique Kerber of Germany celebrates 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 celebrates 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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