Tennis quarter-finals:
Men: Federer vs Isner, Nishikori vs Del Potro, Murray vs Almagro, Djokovic vs Tsonga !
Women: Azarenka vs Kerber, S.Williams vs Wozniacki, Kvitova vs Kirilenko, Maria Sharapova vs Kim Clijster! Gooooooooo Masha,go for gold!!!