Has there ever been a 6–3 in MLS?

Yes, 6 times.

The first time: June 15, 2001, FC Dallas beat Colorado Rapids (Colorado Rapids 3–6 FC Dallas).

The last time: August 20, 2023, St. Louis City SC beat Austin FC (St. Louis City SC 6–3 Austin FC), 3 years ago.

Home wins: 2. Away wins: 4.

Nearby scores

1. 7–2 3 times
2. 7–3 Never
3. 7–4 1 time
4. 6–2 21 times
5. 6–3 6 times
6. 6–4 4 times
7. 5–2 53 times
8. 5–3 26 times
9. 5–4 13 times

All games

1. August 20, 2023 St. Louis City SC 6–3 Austin FC
2. October 27, 2021 FC Cincinnati 3–6 Nashville SC
3. October 7, 2020 LA Galaxy 3–6 Portland Timbers
4. August 3, 2019 Colorado Rapids 6–3 CF Montréal
5. September 13, 2009 LA Galaxy 3–6 FC Dallas
6. June 15, 2001 Colorado Rapids 3–6 FC Dallas