Novak Djokovic of Serbia, right, serves to Stanislas Wawrinka of Switzerland during their ATP world Tour Finals tennis semifinal match at the O2 Arena on London, Sunday, Nov. 10, 2013. (AP Photo/Alastair Grant)

Britain Tennis ATP Finals

Novak Djokovic of Serbia, right, serves to Stanislas Wawrinka of Switzerland during their ATP world Tour Finals tennis semifinal match at the O2 Arena on London, Sunday, Nov. 10, 2013. (AP Photo/Alastair Grant)

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