The 1998 ATP Buenos Aires was an ATP Challenger Series tennis tournament held in Buenos Aires, Argentina. The tournament was held from November 16 to November 23.
| 1998 ATP Buenos Aires | |
|---|---|
| Date | 16–23 November |
| Edition | 26th |
| Location | Buenos Aires, Argentina |
| Champions | |
| Singles | |
 Younes El Aynaoui | |
| Doubles | |
 Guillermo Cañas / Martín García | |
Finals edit
Singles edit
Younes El Aynaoui defeated 
Alberto Martín 7–6, 6–1
Doubles edit
Guillermo Cañas / Martín García defeated Alberto Martín / Salvador Navarro 2–6, 6–3, 7–5