Has there ever been a 9–0 in the Primera Argentina?

Yes, 12 times.

The first time: July 1, 1906, Alumni beat Belgrano Athletic (reservas) (Alumni 9–0 Belgrano Athletic (reservas)).

The last time: September 8, 1974, Boca Juniors beat Puerto Comercial (Boca Juniors 9–0 Puerto Comercial), 52 years ago.

Home wins: 9. Away wins: 3.

Nearby scores

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

All games

1. September 8, 1974 Boca Juniors 9–0 Puerto Comercial
2. October 20, 1971 Newell's Old Boys 9–0 Huracán (Comodoro Rivadavia)
3. May 8, 1938 Independiente 9–0 Almagro
4. December 22, 1935 Lanús 9–0 Quilmes
5. May 5, 1929 Quilmes 9–0 San Isidro
6. November 28, 1926 Porteño 0–9 Boca Juniors
7. August 1, 1926 Boca Juniors 9–0 Argentino de Quilmes
8. December 23, 1923 Boca Alumni 0–9 Boca Juniors
9. April 1, 1920 Sportivo Buenos Aires 0–9 Atlanta
10. May 11, 1913 Belgrano Athletic 9–0 Ferrocarril Sud
11. September 26, 1909 Alumni 9–0 San Isidro
12. July 1, 1906 Alumni 9–0 Belgrano Athletic (reservas)