| 4. Round | 24/06/2018 | Rio Grande Valley FC | - | Phoenix Rising | 0:0 | ||||
| 5. Round | 15/07/2018 | Rio Grande Valley FC | - | Las Vegas Lights FC | 2:0 | ||||
| 5. Round | 29/07/2018 | Rio Grande Valley FC | - | Colorado Springs Switchbacks | 1:0 | ||||
| 6. Round | 23/08/2018 | Los Angeles Galaxy II | - | Rio Grande Valley FC | 1:1 | ||||
| 7. Round | 16/09/2018 | Colorado Springs Switchbacks | - | Rio Grande Valley FC | 1:1 | ||||
| 8. Round | 07/10/2018 | Tulsa Roughnecks | - | Rio Grande Valley FC | 1:2 | ||||
| 8. Round | 14/10/2018 | San Antonio FC | - | Rio Grande Valley FC | 1:1 |
USA