Caroline Wozniacki of Denmark celebrates her victory over Dominika Cibulkova of Slovakia at the Australian Open tennis tournament in Melbourne January 21, 2011. REUTERS

In the previous match on center court, Wozniacki beat Dominika Cibulkova 6-4, 6-3 to avenge last week's loss in a tuneup tournament.

Then she turned the tables on the media. Hearing she'd come across as a bit boring in recent interviews, she opened a post-match news conference with a funny monologue, saying she knew what would be asked so she'd just give her stock answers one-by-one. Then she invited questions on "more interesting" topics. Those included the piano, cricket, soccer and what she's looking for in a boyfriend.

Wozniacki, playing her first Grand Slam as the world No. 1, is seeking her first major win.

"I am happy I got the revenge since I lost to her in Sydney last week; It was not an easy match; She went out there, she was really on fire; You know, I'm happy to be through to the next round," the 20-year-old Danish player worked through the answers to the usual questions.

No. 6 Schiavone beat Monica Niculescu of Romania 6-0, 7-6 (2). Li, who lost to Serena Williams in two tiebreaker sets in last year's semis, advanced with a 6-2, 6-1 win over Barbora Zahlavova Strycova.

Roddick overcame a slow start before powering to victory.

The eighth-seeded Roddick is seeking his second Grand Slam title nearly seven years after his first _ the 2003 U.S. Open.

Haase received treatment on his right ankle early in the first set, getting it heavily taped after appearing to stumble on a shot. The trainer was back out at the end of the set for Haase, who broke Roddick's serve twice.

The Dutchman, despite the injury, made the shot of the tournament so far, chasing down a Roddick lob and hitting a flick backhand over the net while facing the back of the court. Haase won the point two shots later.

"He was playing great early on," Roddick said. "The biggest thing was just to turn it around in the second set."