2. Round | 12/04/2018 | Seattle Sounders 2 | - | Real Monarchs SLC | 1:3 | ||||
3. Round | 13/05/2018 | Seattle Sounders 2 | - | Portland Timbers 2 | 0:1 | ||||
4. Round | 03/06/2018 | Fresno FC | - | Seattle Sounders 2 | 4:0 | ||||
7. Round | 06/09/2018 | Seattle Sounders 2 | - | Tulsa Roughnecks | 4:4 | ||||
8. Round | 07/10/2018 | Orange County SC | - | Seattle Sounders 2 | 2:1 | ||||
8. Round | 11/10/2018 | Seattle Sounders 2 | - | Colorado Springs Switchbacks | 2:2 |