Four other quarterfinal berths will be decided. Third seed Mary Pierce of France looks to avenge her first-round loss to Japan's Ai Sugiyama last week in San Diego when the two meet today.

Also, fourth seed Arantxa Sanchez-Vicario of Spain takes on Ruxandra Dragomir of Romania; sixth-seeded American teenager Serena Williams faces Switzerland's Patty Schnyder; and 1994 champion Amy Frazier of the United States plays Julie Halard-Decugis of France.

Seeded second in this event behind American Lindsay Davenport, Hingis reclaimed the top spot in the WTA rankings when Davenport lost to Serena Williams' older sister Venus in the semifinals of last week's TIG Tennis Classic in San Diego.

On Sunday, Hingis put an exclamation point on her return to the No. 1 ranking with a convincing victory over Williams in the final to win her WTA Tour-leading fifth title of the year.

The 18-year-old Hingis suffered back-to-back defeats at the French Open and Wimbledon and took a temporary break from the game. But she looked impressive in her return to the tour last week as she never lost a set en route to the title.

Raymond celebrated her 26th birthday on Tuesday with a 6-3, 6-1 victory over Wimbledon semifinalist Mirjana Lucic of Croatia. A former NCAA champion, Raymond upset Hingis in Zurich, Switzerland two years ago, one of only five losses Hingis suffered in all of 1997.

On Tuesday, Serena Williams overcame a slow start to defeat Russia's Elena Likhovtseva, 4-6, 6-3, 6-1, in her first singles action since the French Open in June.

Seventh seed Barbara Schett of Austria dumped Ines Gorrochategui of Argentina, 6-3, 6-2, but American Corina Morariu stunned eighth seed Sandrine Testud of France, 6-1, 6-3.

In another match of note, Wimbledon semifinalist Alexandra Stevenson of the United States was beaten by Germany's Anke Huber, 6-4, 6-4.

First prize is $80,000.