Has there ever been a 9–4 in the Eredivisie?

Yes, 1 time.

The only time: November 29, 1964, Feijenoord beat Ajax (Feijenoord 9–4 Ajax).

Nearby scores

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