Top-ranked Justine Henin-Hardenne beat No. 5 Lindsay Davenport 7-5, 6-3 and advanced to the Australian Open semifinals.
Earlier, fourth-seeded Amelie Mauresmo pulled out of her quarterfinal because of torn back muscles. That put Fabiola Zuluaga into the semifinals, where she'll face Henin-Hardenne.
Henin-Hardenne lost the opening four games before reeling off seven of the next eight to take the first set in 52 minutes.
"That wasn't easy. Lindsay was playing unbelievable at the start; I wasn't ready for that," Henin-Hardenne said. "I played every point as best I could. I came back in the set, and that give me confidence."
Davenport lost only one point in her first two service games but ended with 33 unforced errors as her forehand failed in the long rallies. The loss left ex-Gator Lisa Raymond as the only American woman remaining in the singles event. No. 25 Raymond faces No. 22 Patty Schnyder.
Henin-Hardenne, the French Open and U.S. Open champion, next faces the 32nd-seeded Zuluaga. She got a free pass when Mauresmo withdrew 90 minutes before their scheduled match.
Mauresmo "is tough to play, but I can beat her," Zuluaga said. "It feels good to be in the semi, but I didn't want it to be this way the first time. I'd rather play matches than have the rest."
Mauresmo was injured in the fourth round while stretching for a backhand volley against Alicia Molik. Mauresmo had a 10-minute hitting session with coach Loic Courteau, then tearfully announced she was withdrawing.
"I wanted to try this morning and have a little hit and see how I felt. I have pain. I have to withdraw from this tournament," she said. "When I hit some shots, I can feel really strong pain. The other thing is it could get worse if I play. The best thing to do is to rest."
Courteau said Mauresmo insisted on preparing for the match despite scans showing problems in her back.
"As soon as she went up to the net to volley, it was like a knife thrust in her back," he said.
No. 4 Andre Agassi moved on to the semifinals after No. 9 Sebastien Grosjean retired from their match with a groin strain, down 6-2, 2-0.
The last remaining players from the host country were not as fortunate as Agassi. Their opponents finished their matches _ and eliminated the Australians.
The fireworks lit up the sky in the middle of the match. It was not the good omen Lleyton Hewitt or his nation would have hoped for on Australia Day.
Hewitt and Mark Philippoussis, fan favorites in November for winning the Davis Cup, lost while a celebration of the country's national holiday crackled nearby.
Rattled by a foot fault, Hewitt was beaten by No. 2 Roger Federer 3-6, 6-3, 6-0, 6-4 in the fourth round. Philippoussis was eliminated 6-2, 6-2, 6-4 by Morocco's Hicham Arazi, sending the last two Aussies from the tournament.
"It's obviously disappointing when you hit an ace and get a foot fault called," said Hewitt, a two-time major winner once ranked No. 1. "I still wouldn't have won the match. I ran into a guy who was too good for me tonight."
Hewitt has been intent on winning the Australian Open but has never reached the quarterfinals of his home championship.
No Australian has won the title since Mark Edmondson in 1976.
"We always have good matches, but he didn't play his best tennis today," Arazi said.
Federer won nine of 10 games after Hewitt became unsettled by a foot fault that caused him to drop serve in the sixth game of the second set.