It seemed that Tomas Berdych would derail Roger Federer's run at a record 14th Grand Slam title for two sets at the Australian Open.

However, just then, a meltdown was experienced by the 6-foot-5 (1.96-meter) Czech, thus giving a chance to Federer to recover for a 4-6, 6-7 (4-7), 6-4, 6-4, 6-2 win Sunday. This marked only his fourth career comeback from two sets down - to reach the quarter finals.

Until Novak Djokovic took a 5-0 lead, he was not pushed, who then had to work all the way for a 6-1, 7-6 (7-1), 6-7 (5-7), 6-2 victory over 2006 runner-up Marcos Baghdatis of Cyprus.

A source reported, "Djokovic's fellow Serb, women's No. 1-ranked Jelena Jankovic, lost in the fourth round, going down in straight sets to 2007 Wimbledon finalist Marion Bartoli in the day's first match on Rod Laver Arena."

When the 20th-seeded Berdych was on top for the first two sets, working Federer around with powerful forehands to keep the Swiss star on the defensive gloomed the result in the late afternoon.

Following this, Federer bucked up and got the deciding break in the third set when Berdych, missed a 40-0 lead and made spontaneous mistakes on three open court volleys.

Federer will next play with No. 8 Juan Martin del Potro of Argentina, who advanced 5-7, 6-4, 6-4, 6-2 over No. 19 Marin Cilic of Croatia.