Rafael Nadal of Spain serves to 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/Sang Tan)

Britain Tennis ATP Finals

Rafael Nadal of Spain serves to 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/Sang Tan)

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