| Yellow | VS Club | Date | Sections | |
|---|---|---|---|---|
| 4 | Houston Dynamo | 03-05-2008 | League Section | Match details |
| 4 | Columbus Crew | 12-04-2008 | League Section | Match details |
| 3 | Houston Dynamo | 20-08-2008 | League Section | Match details |
| 3 | Los Angeles Galaxy | 14-08-2008 | League Section | Match details |
| 3 | Sporting Kansas City | 09-08-2008 | League Section | Match details |
