Rafael Nadal of Spain celebrates winning the match 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)

APTOPIX Britain Tennis ATP Finals

Rafael Nadal of Spain celebrates winning the match 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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