The 1998 IGA Classic was a women's tennis tournament played on indoor hard courts at The Greens Country Club in Oklahoma City, Oklahoma in the United States that was part of Tier III of the 1998 WTA Tour. It was the 13th edition of the tournament and was held from February 23 through March 1, 1998.
Venus Williams defeated Joannette Kruger 6–3, 6–2
- It was Williams' 2nd title of the year and the 2nd of her career.
Serena Williams / Venus Williams defeated Cătălina Cristea / Kristine Kunce 7–5, 6–2
- It was Serena Williams' 1st title of the year and the 1st of her career. It was Venus Williams' 3rd title of the year and the 3rd of her career.