Has there ever been a 10–4 in the Brasileirão?

Never.

It would be a scorigami. Based on the average number of goals in the Brasileirão, the chance of a game ending 10–4 is about 1 in 18,352,399.

Nearby scores

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