Has there ever been a 10–3 in all competitions?

Yes, 6 times.

The first time: November 18, 1933, Middlesbrough beat Sheffield United (Middlesbrough 10–3 Sheffield United) · Premier League.

The last time: December 8, 1976, Ferro Carril Oeste beat San Lorenzo (Mar del Plata) (Ferro Carril Oeste 10–3 San Lorenzo (Mar del Plata)) · Primera Argentina, 49 years ago.

Home wins: 4. Away wins: 2.

Nearby scores

1. 11–2 3 times
2. 11–3 2 times
3. 11–4 Never
4. 10–2 7 times
5. 10–3 6 times
6. 10–4 3 times
7. 9–2 33 times
8. 9–3 12 times
9. 9–4 2 times

All games

1. December 8, 1976 Ferro Carril Oeste 10–3 San Lorenzo (Mar del Plata) · Primera Argentina
2. September 16, 1951 Olympique de Marseille 3–10 AS Saint-Étienne · Ligue 1
3. August 19, 1945 Tampico 3–10 Atlante · Liga MX
4. October 13, 1940 Sevilla FC 10–3 Valencia CF · La Liga
5. February 4, 1937 Stoke City 10–3 West Bromwich Albion · Premier League
6. November 18, 1933 Middlesbrough 10–3 Sheffield United · Premier League