| 1. Jornada | 25.03.2018 | Swope Park Rangers | - | Seattle Sounders 2 | 4:2 | ||||
| 3. Jornada | 06.05.2018 | Seattle Sounders 2 | - | Sacramento Republic | 1:2 | ||||
| 4. Jornada | 03.06.2018 | Fresno FC | - | Seattle Sounders 2 | 4:0 | ||||
| 4. Jornada | 10.06.2018 | Seattle Sounders 2 | - | OKC Energy FC | 2:1 | ||||
| 5. Jornada | 06.07.2018 | Seattle Sounders 2 | - | Swope Park Rangers | 0:2 | ||||
| 5. Jornada | 08.07.2018 | Seattle Sounders 2 | - | Reno 1868 FC | 1:2 |  |
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| 5. Jornada | 15.07.2018 | Real Monarchs SLC | - | Seattle Sounders 2 | 2:0 | ||||
| 6. Jornada | 20.08.2018 | Portland Timbers 2 | - | Seattle Sounders 2 | 4:1 | |
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| 6. Jornada | 30.08.2018 | Seattle Sounders 2 | - | Saint Louis FC | 1:1 | ||||
| 7. Jornada | 02.09.2018 | Seattle Sounders 2 | - | Orange County SC | 1:1 | ||||
| 7. Jornada | 16.09.2018 | Seattle Sounders 2 | - | Phoenix Rising | 0:1 | ||||
| 8. Jornada | 04.10.2018 | Seattle Sounders 2 | - | Los Angeles Galaxy II | 2:2 | ||||
| 8. Jornada | 11.10.2018 | Seattle Sounders 2 | - | Colorado Springs Switchbacks | 2:2 | ||||
| 8. Jornada | 14.10.2018 | Tulsa Roughnecks | - | Seattle Sounders 2 | 1:4 |
Estados Unidos