
Germany's player Angelique Kerber returns the ball during 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 returns the ball during 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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