Roger Federer of Switzerland lands after returning with a high backhand against David Ferrer of Spain their semi-final singles match on day seven of the ATP World Tour Finals tennis tournament in London on November 26, 2011. Federer won 7-5, 6-3 to book a place in the final. AFP PHOTO / GLYN KIRK (Photo credit should read GLYN KIRK/AFP/Getty Images)

Roger Federer of Switzerland lands after returning with a high backhand against David Ferrer of Spain their semi-final singles match on day seven of the ATP World Tour Finals tennis tournament in London on November 26, 2011. Federer won 7-5, 6-3 to book a place in the final.  AFP PHOTO / GLYN KIRK (Photo credit should read GLYN KIRK/AFP/Getty Images)
Roger Federer of Switzerland lands after returning with a high backhand against David Ferrer of Spain their semi-final singles match on day seven of the ATP World Tour Finals tennis tournament in London on November 26, 2011. Federer won 7-5, 6-3 to book a place in the final. AFP PHOTO / GLYN KIRK (Photo credit should read GLYN KIRK/AFP/Getty Images)
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