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| I | Columbus Crew | - | New York RB | 1:0 (0:0) | ||
| V | New York RB | - | Columbus Crew | 3:0 (1:0) | ||
| I: 04.11.2018 21:00 | V: 12.11.2018 01:30 | Campeones: New York RB | ||||
| I | Portland Timbers | - | Seattle Sounders | 2:1 (2:1) | ||
| V | Seattle Sounders | - | Portland Timbers | 2:4 (0:0, 2:1, 3:2) pn. | ||
| I: 04.11.2018 23:30 | V: 09.11.2018 04:30 | Campeones: Portland Timbers | ||||
| I | New York City FC | - | Atlanta United FC | 0:1 (0:1) | ||
| V | Atlanta United FC | - | New York City FC | 3:1 (2:1) | ||
| I: 05.11.2018 01:30 | V: 11.11.2018 23:30 | Campeones: Atlanta United FC | ||||
| I | Real Salt Lake | - | Sporting Kansas City | 1:1 (0:0) | ||
| V | Sporting Kansas City | - | Real Salt Lake | 4:2 (2:0) | ||
| I: 05.11.2018 04:00 | V: 11.11.2018 21:00 | Campeones: Sporting Kansas City | ||||
