1. Round | 04/03/2018 | Seattle Sounders | - | Los Angeles FC | 0:1 | ||||
3. Round | 05/05/2018 | Seattle Sounders | - | Columbus Crew | 0:0 | ||||
3. Round | 10/05/2018 | Toronto FC | - | Seattle Sounders | 1:2 | ||||
3. Round | 13/05/2018 | Portland Timbers | - | Seattle Sounders | 1:0 | ||||
8. Round | 09/10/2018 | Seattle Sounders | - | Houston Dynamo | 4:1 |