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LONDON, ENGLAND - NOVEMBER 25: Roger Federer of Switzerland poses with the ATP World Tour Champion Trophy during the Barclays ATP World Tour Finals at the O2 Arena on November 25, 2009 in London, England. Federer was crowned ATP World Tour Champion for the fifth time, after becoming just the second player in the history of the ATP Rankings to regain the year-end No. 1 ranking. Federer clinched the 2009 ATP World Tour Champion title by beating Andy Murray at the Barclays ATP World Tour Finals on November 24. (Photo by Julian Finney/Getty Images)

LONDON, ENGLAND - NOVEMBER 25:  Roger Federer of Switzerland poses with the ATP World Tour Champion Trophy during the Barclays ATP World Tour Finals at the O2 Arena on November 25, 2009 in London, England.  Federer was crowned ATP World Tour Champion for the fifth time, after becoming just the second player in the history of the ATP Rankings to regain the year-end No. 1 ranking. Federer clinched the 2009 ATP World Tour Champion title by beating Andy Murray at the Barclays ATP World Tour Finals on November 24.  (Photo by Julian Finney/Getty Images)