Melbourne: Former French Open champion Ana Ivanovic advanced to the fourth round of the Australian Open after beating Jelena Jankovic 7-5, 6-3 in a Friday clash featuring two Serbians who were both former top-ranked players.
Ivanovic surged to a 5-2 lead in the first set but lost the next three games as Jankovic fought back. The 13th-ranked Ivanovic broke Janovic to pull ahead 6-5 and the won the first set with an ace.
The 25-year old Ivanovic had an easier time in the second set, wrapping it up on her second match point.
Ivanovic is now up against No.4 Angieszka Radwanska, while Li Na plays Julia Goerges of Germany.
Ivanovic spent 12 weeks at No. 1 after winning the French Open in 2008. Her next opponent is No.4 Angieszka Radwanska, who is on a 12-match winning streak. Fourth-seeded Radwanska won her 12th match in a row with a 6-3, 6-1 victory over Britain's Heather Watson.
Meanwhile, Sixth-seeded Li Na has also advanced to the fourth round with a 6-4, 6-1 win over Sorana Cirstea of Romania. Li will next play Julia Goerges of Germany, who beat Zheng Jie 6-3, 1-6, 7-5 earlier Friday.
Li, the 2011 French Open champion, is trying to add a second Grand Slam title, and the Australian Open appears to be her best chance. She advanced to the 2010 semifinals, the 2011 final - losing to Kim Clijsters - and the fourth round here last year.