Has there ever been a 10–3 in MLS?

Never.

It would be a scorigami. Based on the average number of goals in MLS, the chance of a game ending 10–3 is about 1 in 989,641.

Nearby scores

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