Has there ever been a 13–12 in the Liga MX?

Never.

It would be a scorigami. Based on the average number of goals in the Liga MX, the chance of a game ending 13–12 is about 1 in 5,563,858,624,350,701.

Nearby scores

1. 14–11 Never
2. 14–12 Never
3. 14–13 Never
4. 13–11 Never
5. 13–12 Never
6. 13–13 Never
7. 12–11 Never
8. 12–12 Never