Ivan Dodig of Croatia, right, and Marcelo Melo of Brazil play a return to Bob Bryan of United States and Mike Bryan of United States 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

Ivan Dodig of Croatia, right, and Marcelo Melo of Brazil play a return to Bob Bryan of United States and Mike Bryan of United States 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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