Second seed Martina Hingis of Switzerland will play her first match since her shocking defeat in the first round of Wimbledon when she faces American Chanda Rubin.

Third seed Steffi Graf of Germany, who defeated Hingis at Roland Garros before losing to American Lindsay Davenport in the Wimbledon final, takes on American Amy Frazier tonight.

Hingis' surprising 6-2, 6-0 loss to Australian teenager Jelena Dokic -- her worst Grand Slam result in five years -- came on the heels of her setback in the emotionally charged French Open final with Graf.

Hingis was booed off the court in Paris after the 18-year-old repeatedly challenged calls and even walked over to Graf's side of the court.

After her loss in London, Hingis took several weeks away from the game to sort out her personal and professional life, even taking a break from her coach and mother, Melanie Molitor. Hingis' mother is back with her this week.

Hingis has won four titles this season, including the Australian Open, and was the winner here in 1997.

Rubin handed Hingis one of her seven defeats this season in the quarterfinals at the Evert Cup in Indian Wells, California five months ago.

Graf also is competing in her first event since her loss to Davenport in London, in what turned out to be the German's last appearance at the All-England Club.

The German star, who has indicated she will retire at the end of the season, has won 13 of her last 14 matches and brings a 16-5 record on hardcourts into this event. She is a four-time champion at this event, winning in 1989-1990 and 1993-94.

In first-round action, sixth seed Arantxa Sanchez-Vicario of Spain faces Russia's Elena Likhovtseva; seventh seed Amanda Coetzer of South Africa takes on American Lisa Raymond; and eighth seed Nathalie Tauziat of France meets German qualifier Anke Huber.

Also, Russian teenager Anna Kournikova goes against American qualifier Meilen Tu; Australian Open runner-up Amelie Mauresmo takes on Sandrine Testud in an all-French affair; Natasha Zvereva of Belarus plays Fabiola Zuluaga of Colombia; and Canada's Maureen Drake meets Dominique Van Roost of Belgium.

On Monday, fifth seed Mary Pierce of France, last year's runner-up, was upset by Japan's Ai Sugiyama, and Spain's Conchita Martinez, the 1995 champion, lost to Austria's Barbara Schett.

Davenport, the top seed, is one-third of the way toward duplicating her California sweep of a year ago. She is 16-1 in her last 17 matches in her home state, dating to last year, when she swept all three summer hardcourt tournaments in California.

The only loss for the 23-year-old Newport Beach resident in that span was to American Serena Williams at Indian Wells in March.

Davenport successfully defended her title at the Bank of the West Classic in Stanford on Sunday, defeating Serena's older sister Venus, 7-6 (7-1), 6-2. The reigning Wimbledon champion is 33-5 this season, including 18-3 on hard courts and will try to win her second straight U.S. Open later this summer.

Seeded fourth, Venus Williams tries to rebound from her loss in Sunday's final as she seeks her fifth title of the year. She is 36-7 in 1999 and has won 13 of 14 matches on hardcourts. Her loss to Davenport was just her fourth in 24 matches on hard surfaces this season.

Davenport, Hingis, Graf and Williams all received first-round byes.

First prize is $80,000.