Olympics - Federer, Williams crashes out

Men's Singles Quarterfinals:
James BLAKE (USA) d. Roger FEDERER (SUI) 6-4, 7-6(2)
Rafael NADAL (ESP) d. Jurgen MELZER (AUT) 6-0, 6-4
Novak DJOKOVIC (SRB) d. Gael MONFILS (FRA) 4-6, 6-1, 6-4

Women's Quarterfinals:
Elena DEMENTIEVA (RUS) d. Serena WILLIAMS (USA) 3-6, 6-4, 6-3