| Yellow | VS Club | Date | |
|---|---|---|---|
| 6 | Seattle Sounders | 05-07-2018 | Match details |
| 5 | Vancouver Whitecaps | 02-07-2018 | Match details |
| 4 | Los Angeles FC | 07-10-2018 | Match details |
| 4 | Seattle Sounders | 30-09-2018 | Match details |
| 4 | DC United | 29-07-2018 | Match details |
| 4 | Portland Timbers | 27-05-2018 | Match details |
| 4 | New York City | 19-05-2018 | Match details |
| 4 | New York Red Bulls | 13-05-2018 | Match details |
| 4 | Orlando City | 29-04-2018 | Match details |
| 4 | Real Salt Lake | 22-04-2018 | Match details |
