Clijsters and Li Will Meet in Fourth Round MELBOURNE, Australia (AP) - A rematch of last year's Australian Open women's final is already in place, with the defending champion Kim Clijsters and Li Na winning Friday to set up a meeting in the fourth round. Li advanced when Anabel Medina Garrigues had to retire with an ankle injury midway through the first set. Clijsters eased past Daniela Hantuchova, 6-3, 6-2. Clijsters's only loss to Hantuchova in 11 matches came at Brisbane two weeks ago when she withdrew with a hip injury in the second set of their semifinal. "I won, so that's the most important thing," Clijsters said. I definitely wasn't playing my best tennis. Top-seeded Caroline Wozniacki has not dropped a set in her quest for a first Grand Slam title. She beat Monica Niculescu of Romania. 6-2, 6-2 Friday, and third-seeded Victoria Azarenka defeated Mona Barthel, 6-2, 6-4. Wozniacki could face Clijsters or Li in the quarterfinals. On Saturday, the two biggest threats in the other half of the draw, the five-time champion Serena Williams and the 2011 Wimbledon winner Petra Kvitova, play for a spot in the last 16. Williams will face Greta Arn of Hungary, while Kvitova will play Maria Kirilenko of Russia. Wozniacki, who needs to reach the quarterfinals to have any chance of retaining the No. 1 ranking, will face Jelena Jankovic. She beat the American Christina McHale, 6-2, 6-0. Azarenka, who defeated Li to win the Sydney International last week, has only lost eight games at Melbourne Park. She remains one of three women who can overtake Wozniacki for the top ranking at the Australian Open. Azarenka was annoyed with herself for needing five match points to finish off Barthel, who was on a 10-match winning run in Australia after capturing her first title at the Hobart International last week as a qualifier. "I've been playing in the end not brave enough to finish the match," said Azarenka, who will next meet Iveta Benesova.