Women's semi-finals day will have added spice to it at the US Open on Friday with the carrot of the number one ranking looming large over the four remaining protagonists.
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American Serena Williams, Russians Dinara Safina and Elena Dementieva and Serbian Jelena Jankovic can all replace another Serbian, Ana Ivanovic, at the top of the rankings by winning the title in New York.
Celebrities at the Open
Photographs: Getty Images