| 6. Round | 12/08/2017 | Seattle Sounders | - | Sporting Kansas City | 1:0 | ||||
| 6. Round | 28/08/2017 | Seattle Sounders | - | Portland Timbers | 1:1 | ||||
| 7. Round | 11/09/2017 | Seattle Sounders | - | Los Angeles Galaxy | 1:1 |  |
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| 7. Round | 17/09/2017 | FC Dallas | - | Seattle Sounders | 0:0 |  |
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| 7. Round | 24/09/2017 | Real Salt Lake | - | Seattle Sounders | 2:0 | |
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| 8. Round | 01/10/2017 | Philadelphia Union | - | Seattle Sounders | 2:0 | ||||
| 8. Round | 16/10/2017 | Seattle Sounders | - | FC Dallas | 4:0 | |
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| 8. Round | 22/10/2017 | Seattle Sounders | - | Colorado Rapids | 3:0 |
USA