Li Na hits a forehand against Caroline Wozniacki on day ten of the Sony Open at Crandon Tennis Center, Miami, March 26, 2014. [Photo/Agencies]

World No 2 Li Na has just upset former world No 1 Caroline Wozniacki to make it into the last four of the Sony Open, setting up anAustralian Open final's rematch with Slovakia's Dominika Cibulkova in the semifinals.

Li became the first Chinese woman to reach the Key Biscayne semis when she beat Caroline Wozniacki 7-5, 7-5 Wednesday.

The in-form Cibulkova fought of three match points to claim a 3-6 7-6 (7-5) 6-3 upset win over third seed Agnieszka Radwanska of Poland on Wednesday to reach the Sony Open semis.

Trailing 5-4 in the second set and serving to stay alive, 10th seed Cibulkova staved off three match points before holding and then breaking Radwanska en route to winning the set in a tiebreak.

Radwanska, with her left knee and right shoulder already heavily taped, called for the trainer at the change over and had even more plaster applied to right hand.

When play resumed Radwanska quickly found herself down a break and could never regain control as Cibulkova, who took out three-time champion Venus Williams in the fourth round, advanced to the final four for the first time in eight trips to Miami.

Six-time championSerena Williams will play five-time runner-upMaria Sharapova in the other semifinal.

Li won the Australian Open in January and is 20-2 this year. She has a 6-0 career record against Cibulkova.