Former world number one Caroline Wozniacki issued a stark warning she was back to her best Wednesday as she ousted China's former French Open champion Li Na to reach the Pan Pacific Open quarter-finals in Tokyo.
Caroline Wozniacki of Denmark hits a return against Li Na of China during their women's singles third round match at the Pan Pacific Open tennis tournament in Tokyo on September 26, 2012. Wozniacki won 4-6, 6-3, 6-4.
Wozniacki ground out a 4-6, 6-3, 6-4 win to join a powerful last eight, where she will play defending champion Agnieszka Radwanska. Maria Sharapova, Samantha Stosur and world number one Victoria Azarenka are also through.
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