| 3. Journée | 20.05.2018 | Reno 1868 FC | - | Seattle Sounders 2 | 1:1 |  |
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| 5. Journée | 27.07.2018 | Seattle Sounders 2 | - | Las Vegas Lights FC | 3:0 |  |
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| 6. Journée | 05.08.2018 | Saint Louis FC | - | Seattle Sounders 2 | 2:0 | |
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| 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 | ||||
| 7. Journée | 06.09.2018 | Seattle Sounders 2 | - | Tulsa Roughnecks | 4:4 | |
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| 8. Journée | 04.10.2018 | Seattle Sounders 2 | - | Los Angeles Galaxy II | 2:2 | |
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| 8. Journée | 11.10.2018 | Seattle Sounders 2 | - | Colorado Springs Switchbacks | 2:2 | |
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États-Unis