Has an Olympic Basketball (Men) game ever ended 89-88?
Exactly once. On August 21, 2016, Spain beat Australia 89-88, and no Olympic Basketball (Men) game before or since has ended that way. When it happened it was a scorigami, the first 89-88 in league history.
That makes 89-88 the 126th most common final score out of 698 that have ever occurred in Olympic Basketball (Men). One point away, 90-88 has happened never and 89-89 has happened never.