Mariusz Fyrstenberg, right, and Marcin Matkowski, both of Poland, play a return to Bob Bryan and Mike Bryan, both of the U.S during their ATP World Tour Finals tennis match at the O2 Arena in London, Saturday, Nov. 9, 2013. (AP Photo/Alastair Grant)

Britain Tennis ATP Finals

Mariusz Fyrstenberg, right, and Marcin Matkowski, both of Poland, play a return to Bob Bryan and Mike Bryan, both of the U.S during their ATP World Tour Finals tennis match at the O2 Arena in London, Saturday, Nov. 9, 2013. (AP Photo/Alastair Grant)

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