Has there ever been a 9–1 in the Bundesliga?

Yes, 4 times.

The first time: April 16, 1966, TSV 1860 München beat Borussia Neunkirchen (Borussia Neunkirchen 1–9 TSV 1860 München).

The last time: March 18, 2000, Bayer Leverkusen beat SSV Ulm 1846 (SSV Ulm 1846 1–9 Bayer Leverkusen), 26 years ago.

Home wins: 2. Away wins: 2.

Nearby scores

1. 10–0 2 times
2. 10–1 Never
3. 10–2 Never
4. 9–0 4 times
5. 9–1 4 times
6. 9–2 3 times
7. 8–0 8 times
8. 8–1 9 times
9. 8–2 5 times

All games

1. March 18, 2000 SSV Ulm 1846 1–9 Bayer Leverkusen
2. October 5, 1974 Eintracht Frankfurt 9–1 Rot-Weiss Essen
3. April 18, 1970 Hertha BSC 9–1 Borussia Dortmund
4. April 16, 1966 Borussia Neunkirchen 1–9 TSV 1860 München