Novak Djokovic of Serbia crouches down as he waits for his partner Rafael Nadal of Spain to serve during their exhibition doubles tennis match against David Nalbandian and Juan Monaco of Argentina in Buenos Aires, Nov 23, 2013. Djokovic and Nadal took part in the match as part of Nalbandian's farewell event as he retires from professional tennis. [Photo/Agencies]
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