All times Pacific times
| 1. Seattle Sounders | Reseeded | ||||
| Sep 14, CAR 0-2 SEA | |||||
| Sep 16, SEA 1-0 CAR | Seattle Sounders | 1. Seattle Sounders | |||
| Sep 21, PR 1-2 SEA | |||||
| 8. Carolina RailHawks | Sep 23, SEA 0-1 PR | ||||
| Series extra time: SEA 1-1 PR | Seattle Sounders | ||||
| 5. Rochester Raging Rhinos | Kicks from the mark: SEA 4-2 PR | ||||
| Sep 14, ATL 2-1 ROC | |||||
| Sep 16, ROC 1-1 ATL | Atlanta Silverbacks | 6. Puerto Rico Islanders | |||
| 4. Atlanta Silverbacks | |||||
| Sep 29, SEA 4-0 ATL | Seattle Sounders | ||||
| 3. Montreal Impact | Champions | ||||
| Sep 14, MON 3-2 PR | |||||
| Sep 16, PR 3-0 MON | Puerto Rico Islanders | 4. Atlanta Silverbacks | |||
| Sep 21, ATL 1-1 POR | |||||
| 6. Puerto Rico Islanders | Sep 23, POR 0-0 ATL | ||||
| Series extra time: POR 0-0 ATL | Atlanta Silverbacks | ||||
| 7. Vancouver Whitecaps | Kicks from the mark: POR 1-3 ATL | ||||
| Sep 14, VAN 1-0 POR | |||||
| Sep 16, POR 3-0 VAN | Portland Timbers | 2. Portland Timbers | |||
| 2. Portland Timbers |
