Ismail reached his highest ATP singles ranking on February 22, 1982, when he became World Number 95. He became runner-up in the 1980 Dutch Open tennis tournament. In 1981, Ismail won two rounds at the French Open, beating Francisco Gonzalez and Eric Deblicker, before losing to 14th-seed Wojtek Fibak.
- Haroon Ismail at the Association of Tennis Professionals
- Haroon Ismail at the International Tennis Federation
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