Has an MLB game ever ended 30-7?

Exactly once. On July 22, 1876, Chicago White Stockings beat Louisville Grays 30-7, and no MLB game before or since has ended that way. When it happened it was a scorigami, the first 30-7 in league history.

Where 30-7 sits among nearby MLB scores. Deeper blue means a score has happened more often; the outlined cell is the new one.

That makes 30-7 the 278th most common final score out of 330 that have ever occurred in MLB. One point away, 31-7 has happened 1 times and 30-8 has happened 1 times.

Every 30-7 in MLB history

Date	Result	Season
1876-07-22	Chicago White Stockings over Louisville Grays	1876

Open the MLB grid at 30-7