Rafael Nadal of Spain plays a return to David Ferrer of Spain during their ATP World Tour Finals single tennis match at the O2 Arena in London Tuesday, Nov. 5, 2013. (AP Photo/Sang Tan)

Britain Tennis ATP Finals

Rafael Nadal of Spain plays a return to David Ferrer of Spain during their ATP World Tour Finals single tennis match at the O2 Arena in London Tuesday, Nov. 5, 2013. (AP Photo/Sang Tan)

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