Has a FIBA World Cup game ever ended 89-80?
Exactly once. On September 1, 2010, Russia beat China 89-80, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 89-80 in league history.
That makes 89-80 the 240th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 90-80 has happened 1 times and 89-81 has happened 2 times.