| 3. Round | 06/05/2018 | OKC Energy FC | - | Swope Park Rangers | 0:1 | ||||
| 3. Round | 10/05/2018 | Real Monarchs SLC | - | Swope Park Rangers | 4:1 | ||||
| 3. Round | 26/05/2018 | Swope Park Rangers | - | Phoenix Rising | 1:0 | ||||
| 4. Round | 03/06/2018 | Saint Louis FC | - | Swope Park Rangers | 2:0 | ||||
| 4. Round | 14/06/2018 | Swope Park Rangers | - | Real Monarchs SLC | 3:2 | ||||
| 4. Round | 18/06/2018 | Fresno FC | - | Swope Park Rangers | 4:1 |  |
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| 5. Round | 06/07/2018 | Seattle Sounders 2 | - | Swope Park Rangers | 0:2 | ||||
| 5. Round | 15/07/2018 | Portland Timbers 2 | - | Swope Park Rangers | 2:1 | |
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| 5. Round | 19/07/2018 | Swope Park Rangers | - | Orange County SC | 0:4 | ||||
| 6. Round | 02/08/2018 | Los Angeles Galaxy II | - | Swope Park Rangers | 1:1 | ||||
| 6. Round | 05/08/2018 | Orange County SC | - | Swope Park Rangers | 2:1 | ||||
| 6. Round | 12/08/2018 | Swope Park Rangers | - | Portland Timbers 2 | 0:2 | ||||
| 8. Round | 04/10/2018 | Sacramento Republic | - | Swope Park Rangers | 3:1 | ||||
| 8. Round | 14/10/2018 | Swope Park Rangers | - | Los Angeles Galaxy II | 5:1 | |
USA