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| 1st(1st leg) | Vancouver Whitecaps | - | Seattle Sounders | 0:0 (0:0) | ||
| 2nd (2nd leg) | Seattle Sounders | - | Vancouver Whitecaps | 2:0 (0:0) | ||
| 1st(1st leg): 30/10/2017 00:30 | 2nd (2nd leg): 03/11/2017 02:30 | Winner: Seattle Sounders | ||||
| 1st(1st leg) | New York RB | - | Toronto FC | 1:2 (1:1) | ||
| 2nd (2nd leg) | Toronto FC | - | New York RB | 0:1 (0:0) | ||
| 1st(1st leg): 30/10/2017 23:00 | 2nd (2nd leg): 05/11/2017 20:00 | Winner: Toronto FC | ||||
| 1st(1st leg) | Houston Dynamo | - | Portland Timbers | 0:0 (0:0) | ||
| 2nd (2nd leg) | Portland Timbers | - | Houston Dynamo | 1:2 (1:1) | ||
| 1st(1st leg): 31/10/2017 01:30 | 2nd (2nd leg): 06/11/2017 00:30 | Winner: Houston Dynamo | ||||
| 1st(1st leg) | Columbus Crew | - | New York City FC | 4:1 (1:0) | ||
| 2nd (2nd leg) | New York City FC | - | Columbus Crew | 2:0 (1:0) | ||
| 1st(1st leg): 01/11/2017 00:00 | 2nd (2nd leg): 05/11/2017 22:00 | Winner: Columbus Crew | ||||
