| 1. Journée | 25.03.2018 | Swope Park Rangers | - | Seattle Sounders 2 | 4:2 |  |
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| 2. Journée | 12.04.2018 | Seattle Sounders 2 | - | Real Monarchs SLC | 1:3 | ||||
| 5. Journée | 21.07.2018 | Phoenix Rising | - | Seattle Sounders 2 | 1:0 | ||||
| 6. Journée | 12.08.2018 | Seattle Sounders 2 | - | San Antonio FC | 3:2 | ||||
| 6. Journée | 30.08.2018 | Seattle Sounders 2 | - | Saint Louis FC | 1:1 | ||||
| 7. Journée | 02.09.2018 | Seattle Sounders 2 | - | Orange County SC | 1:1 | |
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| 7. Journée | 06.09.2018 | Seattle Sounders 2 | - | Tulsa Roughnecks | 4:4 | ||||
| 8. Journée | 04.10.2018 | Seattle Sounders 2 | - | Los Angeles Galaxy II | 2:2 |  |
États-Unis