Victoria Azarenka clinches season-ending world No.1 ranking in Istanbul
Sunday 28 October 2012 22:03, UK
Image:Victoria Azarenka: Will end 2012 as the women's world No.1
Victoria Azarenka secured the season-ending world No.1 spot and set-up a WTA Championships semi-final with Maria Sharapova after batting past Li Na 7-6 (7/4) 6-3 in Istanbul.
