RIO DE JANEIRO, Aug. 7, 2016 - Serbia's Novak Djokovic reacts after losing to Argentina's Del Potro during 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.

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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

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Argentina's Del Potro returns the ball against Serbia's Novak Djokovic during the first round match of men's singles tennis at the 2016 Rio Olympic Games

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Del Potro won the match 2-0. (Xinhua/Liu Jie/IANSArgentina's Del Potro jubilates for scoring against Serbia's Novak Djokovic during the first round match of men's singles tennis at the 2016 Rio Olympic Games

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Venus Williams and Serena Williams lost 0-2.Venus Williams (R) and Serena Williams compete during women's first round doubles tennis match against Czech Republic's Lucie Safarova/Barbora Strycova at the 2016 Rio Olympic Games

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Laura Siegemund of Germany returns the ball against Zhang Shuai of China during a second round match of women's singles tennis at the 2016 Rio Olympic Games in Rio de Janeiro, Brazil, on Aug. 8, 2016. Laura Siegemund won 2-0.

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Juan Martin del Potro won 2-1.Argentina's Juan Martin del Potro reacts during a second round match of men's singles tennis against Portugal's Joao Sousa at the 2016 Rio Olympic Games

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