Germany's player Angelique Kerber celebrates after winning the WTA Finals round robin match against the United States' player Madison Keys at Singapore Indoor Stadium, Oct. 27, 2016. Kerber won 2-0. (Xinhua/Then Chih Wey)
Germany's player Angelique Kerber celebrates after winning the WTA Finals round robin match against the United States' player Madison Keys at Singapore Indoor Stadium, Oct. 27, 2016. Kerber won 2-0. (Xinhua/Then Chih Wey)
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