Juan Martin Del Potro of Argentina cries out after winning a point against Novak Djokovic of Serbia during their ATP World Tour Finals single tennis match at the O2 Arena in London Thursday, Nov. 7, 2013. (AP Photo/Sang Tan)

Britain Tennis ATP Finals

Juan Martin Del Potro of Argentina cries out after winning a point against Novak Djokovic of Serbia during their ATP World Tour Finals single tennis match at the O2 Arena in London Thursday, Nov. 7, 2013. (AP Photo/Sang Tan)

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