| 1. Round | 07/08/1998 | Adanaspor | - | İstanbulspor AŞ | 0:1 |  |
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| 2. Round | 15/08/1998 | İstanbulspor AŞ | - | Samsunspor | 2:1 | |
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| 3. Round | 21/08/1998 | İstanbulspor AŞ | - | Karabükspor | 3:0 | |
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| 4. Round | 29/08/1998 | İstanbulspor AŞ | - | Galatasaray | 1:4 | |
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| 5. Round | 10/09/1998 | Trabzonspor | - | İstanbulspor AŞ | 0:0 | ||||
| 6. Round | 18/09/1998 | İstanbulspor AŞ | - | Sakaryaspor | 4:0 | ||||
| 7. Round | 25/09/1998 | Beşiktaş | - | İstanbulspor AŞ | 2:1 | ||||
| 8. Round | 16/10/1998 | İstanbulspor AŞ | - | MKE Ankaragücü | 1:4 |
Turkey
