| Yellow | VS Club | Date | Sections | |
|---|---|---|---|---|
| 4 | Chivas USA | 14-06-2008 | League Section | Match details |
| 3 | Columbus Crew | 12-07-2008 | League Section | Match details |
| 3 | FC Dallas | 24-05-2008 | League Section | Match details |
| 3 | Chicago Fire | 29-03-2008 | League Section | Match details |
| 2 | Colorado Rapids | 29-08-2008 | League Section | Match details |
| 2 | Houston Dynamo | 16-08-2008 | League Section | Match details |
