Venus beat No. 11-seeded Agnieszka Radwanska of Poland, 6-1, 6-2, and Serena defeated No. 8 Victoria Azarenka of Belarus, 6-2, 6-3.
The five time champion, Venus Williams will be facing No. 1 Dinara Safina of Russia in the Semi Finals that is scheduled to happen on Thursday, Jul 2 while the two time champion Serena Willaims will have to fight No. 4 Elena Dementieva of Russia in the Semis.
If the siblings get past their Russian Opponents, they will be coming head to head on Saturday, Jul 4.