| 1. Portland Timbers | |||
| Sep 1, POR 2-1 SEA | |||
| Sep 5, SEA 1-0 POR | Seattle Sounders | ||
| AET: SEA goal | |||
| 4. Seattle Sounders | Sep 10, SEA 1-0 VAN | ||
| Sep 12, VAN 1-1 SEA | Seattle Sounders | ||
| 3. Minnesota Thunder | Western Conference | ||
| Sep 3, VAN 2-0 MIN | Champions | ||
| Sep 5, MIN 0-1 VAN | Vancouver Whitecaps | ||
| 2. Vancouver Whitecaps | |||
| Sep 18, MON 2-0 SEA | Montreal Impact | ||
| 2. Richmond Kickers | A-League Champions | ||
| Sep 3, RIC 0-1 SYR | |||
| Sep 5, SYR 1-2 RIC | Syracuse Salty Dogs | ||
| PKs: SYR 5-4 RIC | |||
| 3. Syracuse Salty Dogs | Sep 10, SYR 0-2 MON | ||
| Sep 12, MON 1-1 SYR | Montreal Impact | ||
| 4. Rochester Raging Rhinos | Eastern Conference | ||
| Sep 3, ROC 0-1 MON | Champions | ||
| Sep 5, MON 1-0 ROC | Montreal Impact | ||
| 1. Montreal Impact |
