2. Round | 12/04/2018 | Seattle Sounders 2 | - | Real Monarchs SLC | 1:3 | ||||
4. Round | 17/06/2018 | Las Vegas Lights FC | - | Seattle Sounders 2 | 4:1 | ||||
6. Round | 30/08/2018 | Seattle Sounders 2 | - | Saint Louis FC | 1:1 | ||||
8. Round | 04/10/2018 | Seattle Sounders 2 | - | Los Angeles Galaxy II | 2:2 |