1999 IGA SuperThrift Tennis Classic – Singles

The 1999 IGA SuperThrift Classic singles was the singles event of the fourteenth edition of the IGA SuperThrift Classic; a WTA Tier III tournament held in Oklahoma City, United States. First-seded Venus Williams was the defending champion and won in the final 6–4, 6–0 against third-seeded Amanda Coetzer.

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

• # 🇺🇸 Venus Williams (champion)

• # 🇷🇺 Anna Kournikova (semifinals)

• # Amanda Coetzer (final)

• # 🇺🇸 Lisa Raymond (first round)

• # 🇺🇸 Chanda Rubin (quarterfinals)

• # 🇺🇸 Amy Frazier (first round)

• # Mariaan de Swardt (first round)

• # 🇺🇸 Tara Snyder (first round)

Seeds
• # 🇺🇸 Brie Rippner (qualifying competition)

• # 🇦🇺 Nicole Pratt (Qualifier)

• # 🇺🇸 Sandra Cacic (first round)

• # 🇧🇬 Pavlina Stoyanova (first round)

• # 🇺🇸 Jolene Watanabe (second round)

• # 🇺🇸 Karin Miller (first round)

• # 🇵🇱 Aleksandra Olsza (first round)

• # 🇯🇵 Nana Miyagi (Qualifier)

Qualifiers
• # 🇺🇸 Lilia Osterloh

• # 🇺🇸 Mashona Washington

• # 🇯🇵 Nana Miyagi

• # 🇦🇺 Nicole Pratt