Hingis, the 1998 champion, plays No. 31 Silvia Farina Elia of Italy. The winner will face the winner of Tuesday's match between No. 14 Kim Clijsters of Belgium and Russia's Elena Bovina.

Hingis owns a 10-match winning streak and has won 28 of her first 30 matches in 2001. She captured the Qatar Open and Dubai Open in the Middle East last month for a WTA Tour-leading three titles this season.

In January, Hingis defeated Davenport to win the title at Sydney and lost to Jennifer Capriati in the Australian Open final before falling to Davenport in the final at Tokyo. The 20-year-old from Switzerland has reached the final in each of the five events she has played in 2001.

Hingis defeated No. 16 Barbara Schett of Austria in the fourth round while Farina Elia ousted No. 11 Anke Huber of Germany in three sets.

On the men's side, the top two players in the world and nine other seeds are in action.

Top seed Gustavo Kuerten of Brazil, a semifinalist here three years ago, meets American Cecil Mamiit, while No. 2 Marat Safin of Russia, with his new coach Mats Willander courtside, battles Thomas Johansson of Sweden.

Kuerten begin the year with a second-round five-sets loss to Greg Rusedski at the Australian Open, but has bounced back to win 12 matches in a row -- all on clay. He captured titles at Buenos Aires and Acapulco and won two matches for Brazil in Davis Cup action.

However, Kuerten proved last season he is more than a one-surface player, claiming his first hardcourt event at Indianapolis in August and securing the season-ending No. 1 ranking with his win at the Tennis Masters Cup in Lisbon.

Safin reached the fourth round at the Australian Open and the quarterfinals at Milan but snapped a four-match losing streak two weeks ago at the Dubai Tennis Championships. He went on to advance to the final before retiring with a back injury.

Fifth seed Magnus Norman squares off against Nicolas Lapentti of Ecuador in an evening session encounter.

Norman fell to Francisco Clavet on Sunday in the final of at Scottsdale, dropping to 0-2 in ATP championship matches this season. He lost to Lleyon Hewitt in the final at Sydney in January.

Hewitt goes against Spain's Albert Costa earlier. The sixth-seeded Australian was a semifinalist last week at Scottsdale and has won 16 of 20 matches this season. He is 3-1 lifetime against Costa.

In addition, seventh seed Yevgeny Kafelnikov of Russia plays Marcelo Rios of Chile; last year's runnerup Thomas Enqvist of Sweden, the ninth seed, meets Marc Rosset of Switzerland; No. 10 Tim Henman faces Rainer Schuettler of Germany; and 11th-seeded Patrick Rafter of Australia takes on Rusedski.

Also, No. 14 Dominik Hrbaty of Slovakia battles American Jan-Michael Gambill, No. 15 Mark Philippoussis of Australia encounters Mardy Fish of the United States, and No. 16 Sebastien Grosjean of France goes against Byron Black of Zimbabwe.

This $4.95 million event offers a $330,000 first prize for the women's champion and $400,000 for the men's winner.