Serena Williams will return to the top of the world rankings on 31 . I was maybe a point or two away from taking it into a third set At 31 , Petra Kvitova is the oldest woman to achieve the feat . U.S. star defeated Maria Sharapova in quarterfinals at U.S. . Williams to face Serena Williams in semifinals .
Serena Williams will return to the top of the world rankings on 31 . At 31 , Petra Kvitova is the oldest woman to achieve the feat . U.S. star defeated Maria Sharapova in quarterfinals at U.S. . Williams to face Serena Williams in semifinals .