| Tennis News | Tuesday February 19 2013 6:51
Serena Williams has been confirmed as the women's world tennis number one despite her defeat against Victoria Azarenka in the Qatar Open.
The two rivals have swapped places in the latest WTA rankings.
The 31-year-old American becomes the oldest ever woman to claim top spot following her run to the Doha final, moving 265 points clear of Azarenka with Russia's Maria Sharapova remaining third.
There's no change to the top ten in the men's rankings headed by Novak Djokovic.
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