Eighth seed Venus Williams battled into the Australian Open quarter-finals with a 6-4 6-4 victory over talented Polish qualifier Marta Domachowska.

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The Wimbledon champion, who had her right thigh strapped, recovered from an early break down to win the first set and staved off a late fightback from the Pole to line up a clash with fourth seed Ana Ivanovic.

World number 146 Domachowska, in the last 16 of a grand slam event for the first time, broke Williams on her way to a 3-1 lead but the American won five of the next six games to take the set.

Williams squandered a match point when she was broken serving for the match at 5-3 but she broke Domachowska again to clinch victory after 79 minutes.

Earlier on Monday, Ivanovic saved two set points and overcame a stubborn Caroline Wozniacki 6-1 7-6.

The fourth seed, who has not dropped a set in her march to the quarter-finals, dominated the first set by smashing 15 winners to Wozniacki's none and winning 76 percent of her first service points.

After the pair held for two service games each in the second set, the 17-year-old from Copenhagen finally broke the world number three in the fifth game and held two set points in the 10th, but Ivanovic broke to level the score at 5-5.

The Serb then held her own serve and had a match point on Wozniacki's serve, but the young Dane managed to force a tiebreak.

However, Ivanovic's experience held and she ran out a 7-2 tiebreak winner when Wozniacki's service return failed to clear the net.

Agnieszka Radwanska became the first Polish woman to reach a Grand Slam quarter-final when she came from a set and 3-0 down to beat an ailing Nadia Petrova.

Russian 14th seed Petrova led 6-1 3-0 but a groin strain hampered her movement in the third set and Radwanska stormed back to win 1-6 7-5 6-0 and set up a clash with ninth seed Daniela Hantuchova of Slovakia.

Hantuchova came from behind to beat Russian 27th seed Maria Kirilenko 1-6 6-4 6-4 and return the quarter-finals of a Grand Slam for the first since she reached the last eight at Melbourne in 2003.

Having upset second seed Svetlana Kuznetsova in the previous round, Radwanska looked like she might be suffering a reaction as Petrova won nine of the first 10 games.

Radwanska had been struggling in the swirling wind but suddenly she found her game, edging out Petrova in the second set and ripping through the decider for the loss of just four points.

At 18, Radwanska is the youngest of the eight quarter-finalists and the Pole admitted that she did not expect to be in the last eight of a Grand Slam event so soon in her career.

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Reuters