Has there ever been a 9–1 in the Serie A?

Yes, 8 times.

The first time: June 12, 1932, Lazio beat Modena FC (Lazio 9–1 Modena FC).

The last time: April 16, 1961, Juventus FC beat Internazionale (Juventus FC 9–1 Internazionale), 65 years ago.

Home wins: 8. Away wins: 0.

Nearby scores

1. 10–0 1 time
2. 10–1 Never
3. 10–2 Never
4. 9–0 4 times
5. 9–1 8 times
6. 9–2 2 times
7. 8–0 14 times
8. 8–1 4 times
9. 8–2 6 times

All games

1. April 16, 1961 Juventus FC 9–1 Internazionale
2. December 18, 1949 AC Milan 9–1 AS Bari
3. May 8, 1949 Unione Triestina 9–1 Calcio Padova
4. October 31, 1948 Internazionale 9–1 AS Bari
5. July 28, 1946 Torino FC 9–1 Livorno
6. December 23, 1945 Internazionale 9–1 Genoa
7. May 24, 1942 Torino FC 9–1 Atalanta
8. June 12, 1932 Lazio 9–1 Modena FC