Has a FIBA World Cup game ever ended 89-88?
Exactly once. On July 2, 2021, Bahamas beat Cuba 89-88, and no FIBA World Cup 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 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 90-88 has happened never and 89-89 has happened never.