Djokovic knocked out of Olympics in Round 1
World number one Novak Djokovic crashed out of the 2016 Rio Olympics after losing 6-7(4), 6-7(2) against Argentina's Juan Martín del Potro in the first round on Sunday. Del Potro, a one-time US Open champion and the current world number 141, had defeated Djokovic in the bronze-medal match at the 2012 London Olympics as well. 