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ISTANBUL, Oct 26 (Reuters) - Victoria Azarenka will end the year as world number one after the Belarussian beat China's Li Na 7-6 6-3 at the season-ending WTA Championships on Friday.
Azarenka's victory meant she finished second in Group A behind Serena Williams.
The American won all three of her round-robin matches while the world number one registered two victories and a defeat by Williams.
Both players have qualified for the semi-finals. (Editing by Tony Jimenez)