| 1. Round | 01/04/2018 | Fresno FC | - | OKC Energy FC | 2:1 | ||||
| 2. Round | 29/04/2018 | Reno 1868 FC | - | OKC Energy FC | 2:0 | ||||
| 3. Round | 20/05/2018 | OKC Energy FC | - | Colorado Springs Switchbacks | 1:0 | ||||
| 4. Round | 14/06/2018 | Portland Timbers 2 | - | OKC Energy FC | 1:2 | ||||
| 4. Round | 17/06/2018 | OKC Energy FC | - | Rio Grande Valley FC | 3:1 | ||||
| 4. Round | 24/06/2018 | OKC Energy FC | - | Los Angeles Galaxy II | 1:0 | ||||
| 5. Round | 05/07/2018 | San Antonio FC | - | OKC Energy FC | 1:1 | ||||
| 5. Round | 08/07/2018 | OKC Energy FC | - | Colorado Springs Switchbacks | 1:1 | ||||
| 5. Round | 12/07/2018 | OKC Energy FC | - | Las Vegas Lights FC | 6:4 | ||||
| 5. Round | 22/07/2018 | Sacramento Republic | - | OKC Energy FC | 1:1 | ||||
| 5. Round | 29/07/2018 | OKC Energy FC | - | San Antonio FC | 1:2 | ||||
| 6. Round | 05/08/2018 | Colorado Springs Switchbacks | - | OKC Energy FC | 2:0 |
USA