Argentina'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 in Rio de Janeiro, Brazil, on Aug. 7, 2016. Del Potro won the match 2-0.
RIO DE JANEIRO, Aug. 7 (Xinhua) -- Top-ranked Novak Djokovic was knocked out of the Olympic men's singles tennis tournament in the first round Sunday by Juan Martin del Potro.
Del Potro, former U.S Open champion, is ranked 145 in the world after an injury-hit few years, stunned the Serb with a powerful display to win 7-6 (7-4), 7-6 (7-2) in the biggest upset in the tennis tournament.
