TENNIS in DEPTH.

China’s Li Na upset fourth seed and US Open finalist Caroline Wozniacki to reach the Australian Open last eight.

Li, the 16th seed, repeated her win over the Dane in Sydney earlier this month with a 6-4 6-3 victory.

She goes on to face Venus Williams in the quarter-finals after the American battled past Francesca Schiavone 3-6 6-2 6-1, despite an uneven performance.

Top seed and defending champion Serena Williams plays Australian Sam Stosur later on Monday.

Li was down a service break at 4-2 in the opening set against Wozniacki but then took control with six games in a row.

Wozniacki called for the trainer after the fourth game of the second set, receiving treatment on her right thigh and returning to the court with it bandaged.

Neither woman was able to dominate on their own serve and seven successive breaks left Li in position to serve out the match.

The 27-year-old joins countrywoman Zheng Jie in the last eight, and it is the first time two Chinese players have ever reached that stage of a Grand Slam.

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