Rafael Nadal of Spain celebrates winning a point in the first set against David Ferrer of Spain during their ATP World Tour Finals singles tennis match at the O2 Arena in London, Tuesday, Nov. 5, 2013. (AP Photo/Kirsty Wigglesworth)

Britain Tennis ATP Finals

Rafael Nadal of Spain celebrates winning a point in the first set against David Ferrer of Spain during their ATP World Tour Finals singles tennis match at the O2 Arena in London, Tuesday, Nov. 5, 2013. (AP Photo/Kirsty Wigglesworth)

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