Has an Olympic Basketball (Men) game ever ended 91-57?
Exactly once. On August 18, 2008, Croatia beat Iran 91-57, and no Olympic Basketball (Men) game before or since has ended that way. When it happened it was a scorigami, the first 91-57 in league history.
That makes 91-57 the 126th most common final score out of 698 that have ever occurred in Olympic Basketball (Men). One point away, 92-57 has happened 1 times and 91-58 has happened never.