| 3. Round | 22/05/1998 | D.C. United | - | Tampa Bay Mutiny | 3:2 | ||||
| 5. Round | 03/07/1998 | Tampa Bay Mutiny | - | New England Revolution | 2:3 | ||||
| 5. Round | 10/07/1998 | MetroStars | - | Tampa Bay Mutiny | 1:2 | ||||
| 5. Round | 14/07/1998 | Tampa Bay Mutiny | - | Los Angeles Galaxy | 1:3 | ||||
| 5. Round | 17/07/1998 | San Jose Clash | - | Tampa Bay Mutiny | 0:1 | ||||
| 5. Round | 24/07/1998 | Tampa Bay Mutiny | - | Colorado Rapids | 2:3 | ||||
| 5. Round | 28/07/1998 | D.C. United | - | Tampa Bay Mutiny | n.P. | ||||
| 6. Round | 13/08/1998 | Tampa Bay Mutiny | - | New England Revolution | n.P. |  |
|||
| 7. Round | 02/09/1998 | Tampa Bay Mutiny | - | San Jose Clash | 2:1 | ||||
| 7. Round | 12/09/1998 | Tampa Bay Mutiny | - | MetroStars | 2:1 | ||||
| 7. Round | 18/09/1998 | New England Revolution | - | Tampa Bay Mutiny | 3:0 | ||||
| 7. Round | 23/09/1998 | Columbus Crew | - | Tampa Bay Mutiny | 3:4 |
USA