Williams sisters beat Zheng Jie, Yan Zi at U.S. Open
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Yan Zi of China (R) returns a shot as her compatriot Zheng Jie watches during the women's doubles quarter final against Venus and Serena Williams of the US at the U.S. Open tennis tournament in New York, the U.S., Sept. 9, 2009.[Xinhua/Shen Hong]
