1999 Sydney International – Women's singles

The 1999 Sydney International women's singles was the singles event of the fourteenth edition of the ASB Classic; a WTA Tier II tournament and the second most prestigious women's tennis tournament held in Australia. Arantxa Sánchez Vicario was the defending champion but lost in the quarterfinals to Barbara Schett.

Lindsay Davenport won in the final 6–4, 6–3 against Martina Hingis.

Seeds
The top four seeds received a bye to the second round.

• # 🇺🇸 Lindsay Davenport (champion)

• # Martina Hingis (final)

• # 🇪🇸 Arantxa Sánchez Vicario (quarterfinals)

• # 🇺🇸 Venus Williams (quarterfinals)

• # 🇪🇸 Conchita Martínez (second round)

• # 🇩🇪 Steffi Graf (semifinals)

• # Patty Schnyder (quarterfinals)

• # 🇧🇪 Dominique Van Roost (quarterfinals)

Seeds
• # 🇺🇸 Lisa Raymond (second round)

• # 🇸🇰 Henrieta Nagyová (first round)

• # 🇫🇷 Amélie Mauresmo (Qualifier)

• # 🇺🇸 Tara Snyder (first round, retired)

• # 🇦🇹 Sylvia Plischke (second round)

• # 🇨🇿 Adriana Gerši (second round)

• # 🇺🇸 Meghann Shaughnessy (second round)

• # 🇸🇰 Karina Habšudová (Qualifier)

Qualifiers
• # 🇸🇰 Karina Habšudová

• # 🇫🇷 Amélie Mauresmo

• # 🇷🇺 Tatiana Panova

• # 🇦🇷 Inés Gorrochategui