Serbia's Novak Djokovic celebrates victory over Andy Roddick of the US during their men's single tennis match second round for The London 2012 Olympic Games at Wimbledon in London. Djokovic fired a ... more 

Serbia's Novak Djokovic celebrates victory over Andy Roddick of the US during their men's single tennis match second round for The London 2012 Olympic Games at Wimbledon in London. Djokovic fired a warning to his Olympic rivals as the world number two crushed three-time Wimbledon finalist Andy Roddick 6-2, 6-1 in the second round on Tuesday less