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| 1st(1st leg) | New York RB | - | D.C. United | 0:1 (0:0) | ||
| 2nd (2nd leg) | D.C. United | - | New York RB | 1:1 (0:0) | ||
| 1st(1st leg): 21/10/2006 19:00 | 2nd (2nd leg): 29/10/2006 23:00 | Winner: D.C. United | ||||
| 1st(1st leg) | Colorado Rapids | - | FC Dallas | 1:2 (1:1) | ||
| 2nd (2nd leg) | FC Dallas | - | Colorado Rapids | 4:5 (0:0, 1:2, 2:3) pso | ||
| 1st(1st leg): 22/10/2006 02:00 | 2nd (2nd leg): 29/10/2006 01:30 | Winner: Colorado Rapids | ||||
| 1st(1st leg) | Chicago Fire | - | New England Revolution | 1:0 (1:0) | ||
| 2nd (2nd leg) | New England Revolution | - | Chicago Fire | 4:2 (1:1, 2:1, 2:1) pso | ||
| 1st(1st leg): 22/10/2006 18:00 | 2nd (2nd leg): 29/10/2006 00:30 | Winner: New England Revolution | ||||
| 1st(1st leg) | CD Chivas | - | Houston Dynamo | 2:1 (1:0) | ||
| 2nd (2nd leg) | Houston Dynamo | - | CD Chivas | 2:0 (0:0) | ||
| 1st(1st leg): 22/10/2006 21:00 | 2nd (2nd leg): 30/10/2006 01:00 | Winner: Houston Dynamo | ||||
