RIO DE JANEIRO, Aug. 7, 2016 (Xinhua) -- Serbia's Novak Djokovic greets Argentina's Del Potro after the first round match of men's singles tennis at the 2016 Rio Olympic Games in Rio de Janeiro, Brazil, on Aug. 7, 2016. Del Potro won the match 2-0. (Xinhua/Liu Jie/IANS)

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