Venus Williams reached the quarterfinals at the Australian Open for the first time in five years.

The reigning Wimbledon champion advanced today with a 6-4, 6-4 win over Poland's Marta Domachowska at Melbourne Park and will next play No. 4-ranked Ana Ivanovic.

Williams, in her first tournament since withdrawing from the season-ending champion at Madrid in November due to illness, lost in the final here in 2003 to her sister Serena and had not gone beyond the fourth round at the season's opening major since.

Venus Williams has six Grand Slam singles titles, but her run to the 2003 final remains her best performance in the season's first major.

"I have come close, then this girl named Williams took my dream away," Venus said of her Australian aspirations.

Serena Williams, the defending Australian champion, moved into the quarterfinals on Sunday along with top-ranked Justine Henin and last year's finalist Maria Sharapova, seeded fifth.

Serena will play No. 3 Jelana Jankovic and Henin is against Sharapova.

Ivanovic had a 6-1, 7-6 (2) win earlier Monday over Denmark's Caroline Wozniacki, didn't have a single winner in the first set and won just 10 of 25 points on her serve as she dropped serve three times.

"I have a lot of respect for her, she is a great person," Williams said of Ivanovic.

With sister Serena shouting encouragement, Williams had her hands full with Domachowska.

Far from being intimidated by Williams' power, Domachowska matched it with her own, she had aces on three of her first five serves, along with a variety of spins.

Williams often found herself on the defensive as Domachowska swung for winners at every opportunity.

Williams' right thigh was strapped, and Domachowska gave it a workout, keeping her constantly sprinting from side to side.

"I got a little something going on, but it's not going to hurt anybody," Williams coyly said of the strapping.

Williams had to fight back twice from service breaks in the first set, getting back on serve when Domachowska double-faulted on break point, then took the set when the Polish woman netted a straightforward forehand volley.

Williams got the first break of the second set to pull ahead 5-3. Domachowska fended off a match point before breaking back.

Domachowska set up a second match point for Williams with one error while serving 30-30 in the next game, then netted a forehand to finish it off.

"It's good, it gets me ready for the rounds going forward," Williams said of the close match.

Henin beat Taiwan's Hsieh Su-wei yesterday and now will put her 32-match winning streak on the line against Sharapova in their first meeting since the season-ending championship final in Madrid.

Sharapova pounded fellow Russian Elena Dementieva 6-2, 6-0, breaking the 11th-ranked player in six of her seven service games, including one at love to finish off the match in 62 minutes.

"Justine's the one to beat," Sharapova said. "She's on a pretty good winning streak, but every match is new.

"The one in Madrid was tough but physically she got me in the end, she was tougher than I was in the end. But I had many chances and I was very close to winning."

Sharapova was seeded No. 1 last year when Henin skipped the season-opening major because she was going through a divorce. The Russian star lost to Serena Williams in a lopsided final.

Serena Williams advanced to the quarterfinals with a 6-3, 6-4 over No. 11 Nicole Vaidisova, while Jankovic beat Australia's Casey Dellacqua 7-6 (3), 6-1.

Henin won the Sydney International title in the leadup to the Australian Open, beating second-ranked Svetlana Kuznetsova in the final, and has added wins over Aiko Nakamura, Olga Poutchkova and No. 25 Francesca Schiavone at Melbourne Park.

Sharapova has not dropped a set in wins over Jelena Tosic Kostanic, former No. 1-ranked Lindsay Davenport, Elena Vesnina and Dementieva.

Top-ranked Roger Federer, taken to five sets Saturday against Janko Tisparevic, takes on No. 13 Tomas Berdych later today as he continues his bid for a third Australian Open and 13th major.

James Blake faced Marin Cilic, and Lleyton Hewitt met No. 3 Novak Djokovic in a night match.