3 for 1

With Caroline Wozniacki's lost to Kim Clijsters in the quarterfinals she will now drop from the number one ranking and can fall as low as 4 if Sharapova were to make the final. How I understand it will work out is that who ever gets the farthest will become number one. So if two of the three make it to the final the winner would become number 1. 

Maria Sharapova can regain the number one ranking which she last held on June 8. 2008

Petra Kvitova could take the top ranking for the first time. 

Vika Azerenka can take the ranking for the first time as well.