Has an Olympic Baseball game ever ended 18-1?
Exactly once. On January 1, 1992, Cuba beat Italy 18-1, and no Olympic Baseball game before or since has ended that way. When it happened it was a scorigami, the first 18-1 in league history.
That makes 18-1 the 48th most common final score out of 87 that have ever occurred in Olympic Baseball. One point away, 19-1 has happened 1 times and 18-2 has happened 1 times.