| 1. Round | 06/08/1998 | San Lorenzo | - | Platense | 2:2 |  |
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| 2. Round | 15/08/1998 | Colón de Santa Fe | - | San Lorenzo | 2:0 | ||||
| 3. Round | 22/08/1998 | San Lorenzo | - | Vélez Sarsfield | 0:0 | ||||
| 4. Round | 29/08/1998 | River Plate | - | San Lorenzo | 3:4 | |
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| 5. Round | 05/09/1998 | San Lorenzo | - | Estudiantes | 0:0 | ||||
| 6. Round | 10/09/1998 | Argentinos Juniors | - | San Lorenzo | 1:5 | ||||
| 7. Round | 19/09/1998 | Talleres de Córdoba | - | San Lorenzo | 2:2 | ||||
| 8. Round | 26/09/1998 | San Lorenzo | - | Rosario Central | 4:1 | |
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| 9. Round | 03/10/1998 | Independiente | - | San Lorenzo | 3:1 | |
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| 10. Round | 10/10/1998 | San Lorenzo | - | Lanús | 1:1 | ||||
| 11. Round | 17/10/1998 | Unión de Santa Fe | - | San Lorenzo | 3:6 | |
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| 12. Round | 22/10/1998 | San Lorenzo | - | Ferro Carril Oeste | 2:1 | ||||
| 13. Round | 31/10/1998 | Gimnasia de Jujuy | - | San Lorenzo | 3:2 | |
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| 14. Round | 07/11/1998 | San Lorenzo | - | Boca Juniors | 1:3 | |
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| 16. Round | 21/11/1998 | San Lorenzo | - | Huracán | 2:0 | |
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| 18. Round | 05/12/1998 | San Lorenzo | - | Newell's Old Boys | 2:2 |
Argentina