| Yellow | VS Club | Date | Sections | |
|---|---|---|---|---|
| 4 | FC Dallas | 23-08-2008 | League Section | Match details |
| 3 | Chivas USA | 09-08-2008 | League Section | Match details |
| 3 | Toronto FC | 21-06-2008 | League Section | Match details |
| 3 | New York Red Bulls | 17-05-2008 | League Section | Match details |
| 2 | DC United | 02-08-2008 | League Section | Match details |
| 2 | Columbus Crew | 17-07-2008 | League Section | Match details |
