3. Round | 20/05/2018 | Reno 1868 FC | - | Seattle Sounders 2 | 1:1 | ||||
5. Round | 27/07/2018 | Seattle Sounders 2 | - | Las Vegas Lights FC | 3:0 | ||||
6. Round | 05/08/2018 | Saint Louis FC | - | Seattle Sounders 2 | 2:0 | ||||
6. Round | 30/08/2018 | Seattle Sounders 2 | - | Saint Louis FC | 1:1 | ||||
7. Round | 02/09/2018 | Seattle Sounders 2 | - | Orange County SC | 1:1 | ||||
7. Round | 06/09/2018 | Seattle Sounders 2 | - | Tulsa Roughnecks | 4:4 | ||||
8. Round | 04/10/2018 | Seattle Sounders 2 | - | Los Angeles Galaxy II | 2:2 | ||||
8. Round | 11/10/2018 | Seattle Sounders 2 | - | Colorado Springs Switchbacks | 2:2 |