The 1989 Geneva Open was a tennis tournament played on clay courts that was part of the 1989 Nabisco Grand Prix. It was played at Geneva in Switzerland from September 11 through September 18, 1989.
Champions
Men's Singles
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Marc Rosset defeated
Guillermo Pérez-Roldán 6–4, 7–5
- It was Rosset's only title of the year and the 1st of his career.
Men's Doubles
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Andrés Gómez /
Alberto Mancini defeated
Mansour Bahrami /
Guillermo Pérez-Roldán 6–3, 7–5
- It was Gómez's 4th title of the year and the 50th of his career. It was Mancini's 4th title of the year and the 6th of his career.
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January–
June
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- Adelaide (S, D)
- Wellington (S, D)
- Sydney Outdoor (S, D)
- Auckland (S, D)
- Rotterdam (S, D)
- Guarujá(S, D)
- Milan (S, D)
- Memphis (S, D)
- Philadelphia (S, D)
- Lyon (S, D)
- Nancy (S, D)
- Dallas WCT (S)
- Scottsdale WCT (S, D)
- Indian Wells (S, D)
- Miami (S, D)
- Seoul (S, D)
- Rio de Janeiro (S, D)
- Athens (S, D)
- Tokyo Outdoor (S, D)
- Nice (S, D)
- Singapore City (S, D)
- Monte Carlo (S, D)
- Forest Hills WCT (S, D)
- Munich (S, D)
- Hamburg (S, D)
- Charleston (S, D)
- Rome (S, D)
- Florence (S, D)
- London, Queen's Club (S, D)
- Bologna (S, D)
- Bristol (S, D)
- Bari (S, D)
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July–
November
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- Boston (S, D)
- Gstaad (S, D)
- Newport (S, D)
- Schenectady (S, D)
- Hilversum (S, D)
- Stuttgart (S, D)
- Washington (S, D)
- Stratton Mountain (S, D)
- Kitzbuhel (S, D)
- Bastad (S, D)
- Livingston (S, D)
- Prague (S, D)
- Indianapolis (S, D)
- Montreal (S, D)
- Cincinnati (S, D)
- St. Vincent (S, D)
- Geneva (S, D)
- Madrid (S, D)
- Barcelona (S, D)
- Los Angeles (S, D)
- San Francisco (S, D)
- Bordeaux(S, D)
- Palermo (S, D)
- Brisbane (S, D)
- Orlando (S, D)
- Basel (S, D)
- Toulouse (S, D)
- Sydney Indoor (S, D)
- Tel Aviv (S, D)
- Vienna (S, D)
- Tokyo Indoor (S, D)
- Frankfurt (S, D)
- Paris (S, D)
- Sao Paulo (S, D)
- Stockholm (S, D)
- Wembley (S, D)
- Johannesburg (S, D)
- Itaparica (S, D)
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