Has there ever been a 9–1 in the Primera Argentina?

Yes, 10 times.

The first time: June 15, 1895, Lomas Academy beat Quilmes Rovers (Quilmes Rovers 1–9 Lomas Academy).

The last time: April 11, 1982, Rosario Central beat Mariano Moreno (Junín) (Mariano Moreno (Junín) 1–9 Rosario Central), 44 years ago.

Home wins: 5. Away wins: 5.

Nearby scores

1. 10–0 6 times
2. 10–1 7 times
3. 10–2 3 times
4. 9–0 12 times
5. 9–1 10 times
6. 9–2 5 times
7. 8–0 32 times
8. 8–1 28 times
9. 8–2 16 times

All games

1. April 11, 1982 Mariano Moreno (Junín) 1–9 Rosario Central
2. November 24, 1963 Independiente 9–1 San Lorenzo
3. June 15, 1941 Atlanta 9–1 Rosario Central
4. July 30, 1939 Lanús 9–1 Ferro Carril Oeste
5. April 7, 1935 Estudiantes de La Plata 9–1 Lanús
6. March 29, 1931 Honor y Patria 1–9 Boca Juniors
7. May 9, 1907 Barracas Athletic 9–1 San Martín Athletic
8. August 29, 1897 Belgrano Athletic (reservas) 1–9 Lomas Athletic
9. June 6, 1897 Banfield Athletic 1–9 Flores Athletic
10. June 15, 1895 Quilmes Rovers 1–9 Lomas Academy