ISTANBUL (Reuters) - China's Li Na made it a hat-trick of White Group victories, overpowering back-injury victim Victoria Azarenka 6-2 6-1 on Friday to march through to the semi-finals of the WTA Championship.
Li next meets Czech Petra Kvitova, who beat German Angelique Kerber 6-7 6-2 6-3 in the Red Group, while world number one Serena Williams takes on Serb Jelena Jankovic in Saturday's other semi-final.
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