Hingis posted a thrilling 6-2, 3-6, 8-6 victory over Serena Williams, who was two points away from reaching a semifinal meeting with her sister. Instead, Hingis, the top seed from Switzerland, will play Venus Williams for the third straight Grand Slam.

Venus Williams also was close to an exit but rallied for a 2-6, 6-1, 8-6 triumph over 10th seed Amanda Coetzer of South Africa in the day's first quarterfinal. Williams is 7-9 lifetime vs. Hingis but has won the last two meetings at Wimbledon and the U.S. Open last year.

In men's quarterfinal action, former champion Yevgeny Kafelnikov of Russia, seeded fifth, meets No. 15 Arnaud Clement of France. Another seeded Frenchman, No. 16 Sebastien Grosjean, goes against unseeded 1997 finalist Carlos Moya of Spain.

Gunning for a fourth Australian Open title in five years, Hingis improved to 6-4 lifetime against Serena Williams, winning the last three matches.

Hingis is seeking her first Grand Slam title since winning here in 1999. She was denied a fourth straight title in Melbourne with a loss to Lindsay Davenport in last year's final.

The 20-year-old Hingis is unbeaten in 12 matches this season after helping Switzerland win the Hopman Cup in Perth and capturing the adidas International two weeks ago.

Venus Williams extended her winning streak on hard courts to 30 matches and has won 19 straight Grand Slam matches since falling to Arantxa Sanchez-Vicario in the quarterfinals of last year's French Open.

Kafelnikov, the highest seed left in the men's draw, moved into the quarterfinals Monday with a straight-sets victory over unseeded Swede Andreas Vinciguerra. The 26-year-old Russian is 17-1 at the Australian Open since 1999, when he won the title. He was runner-up to Andre Agassi last year.

Things have gotten progressively easier for Kafelnikov, who overcame American Chris Woodruff in four sets on Saturday after needing five sets to eliminate Germany's Nicolas Kiefer in the previous round.

Clement dispatched Britain's Greg Rusedski in straight sets on Monday to advance to his second straight Grand Slam quarterfinal. It matched his performance at last year's U.S. Open.

The 23-year-old Frenchman is 1-2 lifetime against Kafelnikov. He earned his first win over the Russian at Cincinnati last year, 6-4, 6-1, on hard courts.

"It won't be an easy match for both of us, no matter how good we are playing," Kafelnikov said. "I'm expecting a tough match, even though people think I'm the favorite to win. I'm sure each point in that match would be exciting. I wouldn't make any prediction on who's going to win that match."

Grosjean eliminated fourth seed Magnus Norman of Sweden in four sets Monday to reach his first career Grand Slam quarterfinal. The former junior No. 1 dropped his only set of the tournament to Norman.

Moya eliminated unseeded German Rainer Schuttler in straight sets Monday to reach his first Grand Slam quarterfinal since his U.S. Open semifinal showing in 1998.

A former world No. 1, Moya appears to be back at 100 percent after being hampered by recurrent back problems over the last two years. He dumped former top-ranked player Marcelo Rios of Chile in straight sets in the first round and recorded his biggest win of the tournament by outlasting seventh seed Lleyton Hewitt of Australia in five sets in the third round.

Moya and Grosjean have split their two previous encounters. The Spaniard defeated Grosjean en route to winning his only Grand Slam title at the French Open in 1998. Grosjean gained revenge at Key Biscayne one year later to reach his first final in a Tennis Masters Series event.