| Yellow | Clubs | VS Club | Date | Sections | |
|---|---|---|---|---|---|
| 7 | DC United | Chicago Fire | 16-08-2008 | League Section | Match details |
| 6 | DC United | Chicago Fire | 07-06-2008 | League Section | Match details |
| 5 | FC Dallas | Sporting Kansas City | 23-08-2008 | League Section | Match details |
| 5 | New England Revolution | Chicago Fire | 09-08-2008 | League Section | Match details |
| 5 | Colorado Rapids | Toronto FC | 09-08-2008 | League Section | Match details |
| 5 | Houston Dynamo | Real Salt Lake | 03-07-2008 | League Section | Match details |
| 5 | San Jose Earthquakes | Columbus Crew | 07-06-2008 | League Section | Match details |
| 4 | Sporting Kansas City | FC Dallas | 23-08-2008 | League Section | Match details |
| 4 | DC United | New York Red Bulls | 10-08-2008 | League Section | Match details |
| 4 | DC United | Houston Dynamo | 23-07-2008 | League Section | Match details |
