Tennis - Olympics: Day 2 - 1 of 57 (Juan Martin Del Potro)

Tennis - Olympics: Day 2 - 1 of 57
In This Photo: Juan Martin Del Potro
Argentina's Juan Martin del Potro returns the ball to Serbia's Novak Djokovic during their men's first round singles tennis match at the Olympic Tennis Centre of the Rio 2016 Olympic Games in Rio de Janeiro on August 7, 2016. / AFP / Roberto SCHMIDT
(Aug. 6, 2016 - Source: AFP)