MLS is Back
USA
| Referee | Games |  |  | Cards per game |
|---|
| Fotis Bazakos | 2 | 11 | 1 | 6.0 (5.5 / 0.5) | |
| Allen Chapman | 4 | 13 | 0 | 3.3 (3.3 / 0.0) | |
| Alex Chilowicz | 3 | 14 | 0 | 4.7 (4.7 / 0.0) | |
| Marcos de Oliveira | 3 | 9 | 0 | 3.0 (3.0 / 0.0) | |
| Joe Dickerson | 3 | 12 | 1 | 4.3 (4.0 / 0.3) | |
| Ismail Elfath | 4 | 16 | 1 | 4.3 (4.0 / 0.3) | |
| Drew Fischer | 4 | 10 | 2 | 3.0 (2.5 / 0.5) | |
| Timothy Ford | 2 | 9 | 0 | 4.5 (4.5 / 0.0) | |
| David Gantar | 1 | 4 | 2 | 6.0 (4.0 / 2.0) | |
| Guido Gonzales Jr. | 2 | 10 | 0 | 5.0 (5.0 / 0.0) | |
| Jair Marrufo | 5 | 14 | 0 | 2.8 (2.8 / 0.0) | |
| Rosendo Mendoza | 2 | 10 | 1 | 5.5 (5.0 / 0.5) | |
| Silviu Petrescu | 1 | 4 | 1 | 5.0 (4.0 / 1.0) | |
| Victor Rivas | 3 | 15 | 2 | 5.7 (5.0 / 0.7) | |
| Robert Sibiga | 3 | 16 | 0 | 5.3 (5.3 / 0.0) | |
| Ramy Touchan | 4 | 18 | 1 | 4.8 (4.5 / 0.3) | |
| Rubiel Vazquez | 2 | 9 | 0 | 4.5 (4.5 / 0.0) | |
| Armando Villareal | 3 | 12 | 0 | 4.0 (4.0 / 0.0) | |
England