Has there ever been a 13–1 in the Primera Argentina?

Yes, 1 time.

The only time: October 6, 1974, Banfield beat Puerto Comercial (Banfield 13–1 Puerto Comercial).

Nearby scores

1. 14–0 2 times
2. 14–1 Never
3. 14–2 Never
4. 13–0 Never
5. 13–1 1 time
6. 13–2 Never
7. 12–0 4 times
8. 12–1 1 time
9. 12–2 Never