The 1998 IGA Tennis 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.

[1] Venus Williams defeated Joannette Kruger 6–3, 6–2 Serena Williams / Venus Williams defeated Cătălina Cristea / Kristine Kunce 7–5, 6–2

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