Has there ever been a 6–3 in the Primeira Liga?

Yes, 1 time.

The only time: March 3, 1996, FC Porto beat SC Braga (FC Porto 6–3 SC Braga).

Nearby scores

1. 7–2 1 time
2. 7–3 Never
3. 7–4 Never
4. 6–2 7 times
5. 6–3 1 time
6. 6–4 Never
7. 5–2 31 times
8. 5–3 13 times
9. 5–4 Never