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Serena Williams of the U.S. hits a return to Kim Clijsters of Belgium during their semi-final match at the U.S. Open tennis tournament in New York, September 12, 2009. Clijsters won the match 6-4 7-5, which ended in controversy when Williams was called for a foot-fault on a second serve to go match point down. [Xinhua/Shen Hong]
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