World No . 1 Roger Federer through to the last 16 of the Olympic singles tournament . He and Swiss partner Stanislas David win every set of their Olympic title defense . No . 1 World No . 2 Novak Djokovic loses in his first - round doubles match alongside Viktor Troicki . The Serbian will play Andy Roddick in round two of the doubles after the American wins .
World No . 1 Roger Federer through to the last 16 of the Olympic singles tournament . He and Swiss partner Stanislas David win every set of their Olympic title defense . World No . 2 Novak Djokovic loses in his first - round doubles match alongside Viktor Troicki . The Serbian will play Andy Roddick in round two of the doubles after the American wins .