Has there ever been a 9–3 in the Bundesliga?

Yes, 1 time.

The only time: November 16, 1963, Borussia Dortmund beat 1. FC Kaiserslautern (Borussia Dortmund 9–3 1. FC Kaiserslautern).

Nearby scores

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