Has there ever been a 7–4 in the Liga MX?

Yes, 1 time.

The only time: July 17, 1949, España beat Puebla (España 7–4 Puebla).

Nearby scores

1. 8–3 1 time
2. 8–4 Never
3. 8–5 Never
4. 7–3 7 times
5. 7–4 1 time
6. 7–5 2 times
7. 6–3 21 times
8. 6–4 17 times
9. 6–5 3 times