Has there ever been a 10–4 in the Liga MX?

Yes, 1 time.

The only time: October 28, 1945, Atlante beat Monterrey (Atlante 10–4 Monterrey).

Nearby scores

1. 11–3 1 time
2. 11–4 Never
3. 11–5 Never
4. 10–3 1 time
5. 10–4 1 time
6. 10–5 Never
7. 9–3 2 times
8. 9–4 Never
9. 9–5 Never