1. Round 07/08/1998 Adanaspor - İstanbulspor AŞ 0:1
2. Round 15/08/1998 İstanbulspor AŞ - Samsunspor 2:1 Goal
3. Round 21/08/1998 İstanbulspor AŞ - Karabükspor 3:0
4. Round 29/08/1998 İstanbulspor AŞ - Galatasaray 1:4
5. Round 10/09/1998 Trabzonspor - İstanbulspor AŞ 0:0
6. Round 18/09/1998 İstanbulspor AŞ - Sakaryaspor 4:0 Goal
7. Round 25/09/1998 Beşiktaş - İstanbulspor AŞ 2:1
8. Round 16/10/1998 İstanbulspor AŞ - MKE Ankaragücü 1:4 yellow card
9. Round 23/10/1998 Antalyaspor - İstanbulspor AŞ 2:3
10. Round 30/10/1998 İstanbulspor AŞ - Gaziantepspor 0:0
11. Round 07/11/1998 Altay Izmir - İstanbulspor AŞ 2:1
12. Round 14/11/1998 İstanbulspor AŞ - Bursaspor 2:3 GoalGoal
13. Round 20/11/1998 Kocaelispor - İstanbulspor AŞ 0:1
14. Round 27/11/1998 İstanbulspor AŞ - Dardanelspor 1:1
15. Round 04/12/1998 Erzurumspor (1968-2015) - İstanbulspor AŞ 2:4 yellow card
16. Round 12/12/1998 Fenerbahçe - İstanbulspor AŞ 2:0
17. Round 19/12/1998 İstanbulspor AŞ - Gençlerbirliği 0:0
19. Round 06/02/1999 Samsunspor - İstanbulspor AŞ 0:1
22. Round 26/02/1999 İstanbulspor AŞ - Trabzonspor 0:0
23. Round 05/03/1999 Sakaryaspor - İstanbulspor AŞ 3:0
24. Round 13/03/1999 İstanbulspor AŞ - Beşiktaş 0:2
28. Round 16/04/1999 İstanbulspor AŞ - Altay Izmir 3:0
29. Round 24/04/1999 Bursaspor - İstanbulspor AŞ 2:0
30. Round 01/05/1999 İstanbulspor AŞ - Kocaelispor 2:1
31. Round 09/05/1999 Dardanelspor - İstanbulspor AŞ 5:1 Goal
32. Round 15/05/1999 İstanbulspor AŞ - Erzurumspor (1968-2015) 0:2
33. Round 22/05/1999 İstanbulspor AŞ - Fenerbahçe 1:2
34. Round 29/05/1999 Gençlerbirliği - İstanbulspor AŞ 2:3