| 6. Round | 19/08/2018 | Rio Grande Valley FC | - | OKC Energy FC | 2:4 | ||||
| 6. Round | 26/08/2018 | OKC Energy FC | - | Seattle Sounders 2 | 3:0 |  |
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| 7. Round | 02/09/2018 | Swope Park Rangers | - | OKC Energy FC | 1:0 | ||||
| 7. Round | 09/09/2018 | Orange County SC | - | OKC Energy FC | 3:2 | ||||
| 7. Round | 13/09/2018 | Los Angeles Galaxy II | - | OKC Energy FC | 1:3 | ||||
| 7. Round | 24/09/2018 | OKC Energy FC | - | Sacramento Republic | 0:0 | ||||
| 7. Round | 30/09/2018 | Las Vegas Lights FC | - | OKC Energy FC | 0:1 | ||||
| 8. Round | 04/10/2018 | Real Monarchs SLC | - | OKC Energy FC | 2:1 | ||||
| 8. Round | 14/10/2018 | Saint Louis FC | - | OKC Energy FC | 0:0 |
Canada
Italy