Serena Williams of the US, (right) and Victoria Azarenka of Belarus after their match on the third day of the WTA championship in Istanbul, Turkey, on Thursday. Photo: AFP

Serena downs number one Azarenka again

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Serena Williams of the US, (right) and Victoria Azarenka of Belarus after their match on the third day of the WTA championship in Istanbul, Turkey, on Thursday. Photo: AFP
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