Has a FIBA World Cup game ever ended 99-87?
Exactly once. On August 22, 1982, Spain beat Australia 99-87, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 99-87 in league history.
That makes 99-87 the 240th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 100-87 has happened never and 99-88 has happened 2 times.