Bob Bryan of United States, right, and Mike Bryan of United States touch hands after they play a return to Ivan Dodig of Croatia and Marcelo Melo of Brazil during their ATP World Tour Finals tennis match at the O2 Arena in London, Tuesday, Nov. 5, 2013. (AP Photo/Kirsty Wigglesworth)

Britain Tennis ATP Finals

Bob Bryan of United States, right, and Mike Bryan of United States touch hands after they play a return to Ivan Dodig of Croatia and Marcelo Melo of Brazil during their ATP World Tour Finals tennis match at the O2 Arena in London, Tuesday, Nov. 5, 2013. (AP Photo/Kirsty Wigglesworth)

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