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Roger Federer of Switzerland hits a return to Nikolay Davydenko of Russia during their quarter-final round match at the Cincinnati Masters tennis tournament in Cincinnati, Ohio August 20, 2010. [Xinhua]
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![Roger Federer of Switzerland hits a return to Nikolay Davydenko of Russia during their quarter-final round match at the Cincinnati Masters tennis tournament in Cincinnati, Ohio August 20, 2010. [Xinhua]](http://images.china.cn/attachement/jpg/site1007/20100821/000cf1bdd03f0dd9b36202.jpg "Roger Federer of Switzerland hits a return to Nikolay Davydenko of Russia during their quarter-final round match at the Cincinnati Masters tennis tournament in Cincinnati, Ohio August 20, 2010. [Xinhua]")
