Sylvia Hanika, the No. 17 computer-ranked player in the world, yesterday withdrew from the $150,000 Virginia Slims of Washington tennis tournament because of the flu.

The 32-player tournament, which begins Monday at the George Washington University Smith Center, announced its main draw yesterday with Martina Navratilova, the No. 1 computer-ranked player, the top seed. Defending champion Hana Mandlikova is seeded second.

Navratilova will play Andrea Leand of Brooklandville, Md., in the first round. Mandlikova's first-round opponent will be Marcella Mesker of The Netherlands. Kim Shaefer of Alexandria drew No. 4 seed Manuela Maleeva of Bulgaria as her opening opponent

The tournament finals will be Monday, Jan. 14. FIRST-ROUND PAIRINGS

Martina Navratilova vs. Andrea Leand, Carling Bassett vs. qualifier, Anne Minter vs. Bonnie Gadusek, Helena Sukova vs. qualifier.

Wendy Turnbull vs. Gigi Fernandez, Lisa Bonder vs. qualifier, Debbie Spence vs. qualifier, Ann Henricksson vs. Zina Garrison.

Kathy Jordan vs. Sharon Walsh, Yvonne Vermaak vs. JoAnne Russell, Gabriela Sabatini vs. Camille Benjamin, Kim Shaefer vs. Manuela Maleeva.

Claudia Kohde-Kilsch vs. Kathy Rinaldi, Terry Phelps vs. Pam Casale, Pascale Paradis vs. Elizabeth Sayers-Smylie, Marcella Mesker vs. Hana Mandlikova. SEEDS

1, Navratilova; 2, Mandlikova; 3, Turnbull; 4, Maleeva; 5, Sukova; 6, Kohde-Kilsch; 7, Garrison; 8, Jordan.