ATP World Tour Finals - Day Seven

ATP World Tour Finals - Day Seven
LONDON, ENGLAND - NOVEMBER 11: Jelena Ristic, the girlfriend of Novak Djokovic of Serbia applauds before his men's singles semifinal match against Juan Martin Del Potro of Argentina during day seven of the ATP World Tour Finals at O2 Arena on November 11, 2012 in London, England. (Photo by Julian Finney/Getty Images)
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