The women's world No.1 ranking switched hands yesterday for the first time in almost a year but the identity of the next occupant of top spot still remains to be decided.
Caroline Wozniacki's 6-3, 7-6 defeat by Kim Clijsters, the defending champion, in the quarter-finals not only kept alive the Belgian's chances of winning a fifth grand slam title but also opened the door for any one of three women to take over at the top.
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