Has there ever been a 14–0 in the Liga MX?

Yes, 1 time.

The only time: May 26, 1946, Veracruz beat Monterrey (Veracruz 14–0 Monterrey).

Nearby scores

1. 15–0 Never
2. 15–1 Never
3. 14–0 1 time
4. 14–1 Never
5. 13–0 Never
6. 13–1 Never