Page last updated at 08:47 GMT, Sunday, 12 September 2010 09:47 UK
Roger Federer struggles to explain US Open defeat
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Roger Federer admits his game lacked something, but struggles to pinpoint what, after being knocked out of the US Open semi-finals by Serbia's Novak Djokovic 5-7 6-1 5-7 6-2 7-5.
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