Hingis crushed Virginia Ruano-Pascual of Spain, 6-2, 6-1 on Wednesday after receiving a first-round bye.

The 15th-seeded Nagyova, who also had a first-round bye, needed to rally to beat American Lilia Osterloh, 3-6, 6-2, 7-6 (7-4) in her second-round match.

Hingis has captured all WTA Tour Tier I tournaments and three of the four Grand Slams but has not captured this event, which has been won by all the other No. 1 players in the last 20 years.

Hingis lost to Venus Williams in the semifinals at the Ericsson Open in Miami two weeks ago but has three titles this season and a 34-4 match record.

Third-seeded Elena Dementieva of Russia meets countrywoman Elena Likhovtseva Thursday in a third-round match.

Dementieva has won 11 of her last 14 matches and beat France's Natalie Dechy, 6-4, 6-3 on Tuesday. She reached her first WTA Tour final at the Mexican Open last month and followed with a quarterfinal effort at Indian Wells and a semifinal showing at Miami.

Likhovtseva, the 16th seed, downed Rosanna De Los Rios of Paraguay, 6-4, 6-4 on Wednesday.

Fourth-seeded Amanda Coetzer of South Africa will face No. 13 Jelena Dokic of Yugoslavia in a third-round match.

Coetzer was leading 7-5, 3-0 when her opponent Tatiana Panova was forced to retire on Wednesday due to dehydration.

Dokic defeated Switzerland's Patty Schnyder, 7-5, 6-3 on Tuesday.

Sixth-seeded Amelie Mauresmo of France hopes to continue her roll when she plays American Lisa Raymond. Mauresmo extended her winning streak to 11 matches with a 6-2, 6-1 victory over American Kristina Brandi on Wednesday. She won titles in her homeland at Paris and Nice in February.

Raymond, the 12th seed, posted a 6-4, 6-1 win over countrywoman Jennifer Hopkins on Tuesday.

Seventh-seeded Arantxa Sanchez-Vicario faces No. 9 Paola Suarez of Argentina in the Round of 16. The winner will likely meet Hingis in the quarterfinals.

Sanchez-Vicario, a two-time champion fresh off winning her first title of the year at Porto, Portugal last week, continued her good form with a second-round victory over Pavlina Nola of Bulgaria, 6-3, 6-3 on Wednesday.

Suarez prevailed in a tough second-round match against Anastasia Myskina of Russia, 7-5, 6-7 (6-8), 7-5.

Americans Meghann Shaughnessy and Meilen Tu meet in a third-round match. Shaughnessy, the 10th seed, rallied to beat Sandra Cacic, 2-6, 6-0, 7-5 and Tu defeated Erika De Lone, 3-6, 6-2, 6-2.

In other third-round matches on Thursday, Silvia Farina Elia of Italy faces Maria Emilia Salerni of Argentina and American Jill Craybas plays Nadia Petrova of Russia.

Farina Elia upset second-seeded Conchita Martinez of Spain, 6-4, 6-1 on Wednesday.

It was the fourth straight loss for Martinez, who last won at the Australian Open.