| 21. Round | 27/03/1998 | Petrochemia Plock | - | Groclin Dyskobolia | 1:0 | ||||
| 22. Round | 03/04/1998 | Pogoń Szczecin | - | Petrochemia Plock | 2:0 | ||||
| 23. Round | 07/04/1998 | Petrochemia Plock | - | Stomil Olsztyn | 2:1 | ||||
| 24. Round | 10/04/1998 | Widzew Łódź | - | Petrochemia Plock | 3:0 | ||||
| 25. Round | 17/04/1998 | Amica Wronki | - | Petrochemia Plock | 1:1 |  |
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| 26. Round | 24/04/1998 | Petrochemia Plock | - | GKS Katowice | 1:0 | ||||
| 27. Round | 01/05/1998 | Legia Warszawa | - | Petrochemia Plock | 3:0 | ||||
| 28. Round | 08/05/1998 | Petrochemia Plock | - | ŁKS Łódź | 1:1 | ||||
| 29. Round | 15/05/1998 | KSZO Ostrowiec | - | Petrochemia Plock | 2:1 | ||||
| 30. Round | 19/05/1998 | Petrochemia Plock | - | Lech Poznań | 1:0 | ||||
| 31. Round | 29/05/1998 | Zagłębie Lubin | - | Petrochemia Plock | 2:0 | |
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| 32. Round | 02/06/1998 | Petrochemia Plock | - | Górnik Zabrze | 1:1 | ||||
| 33. Round | 05/06/1998 | Wisła Kraków | - | Petrochemia Plock | 5:0 | |
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| 34. Round | 08/06/1998 | Petrochemia Plock | - | Odra Wodzisław | 1:6 |
Poland