LONDON, ENGLAND - NOVEMBER 23: Roger Federer of Switzerland (L) and Former Argentinian footballer Diego Maradona attend the ATP World Tour Finals at O2 Arena on November 23, 2010 in London, England. (Photo by Clive Brunskill/Getty Images)
LONDON, ENGLAND - NOVEMBER 23: Roger Federer of Switzerland (L) and Former Argentinian footballer Diego Maradona attend the ATP World Tour Finals at O2 Arena on November 23, 2010 in London, England. (Photo by Clive Brunskill/Getty Images)