Has a FIBA World Cup game ever ended 89-61?
Exactly once. On September 16, 2018, Nigeria beat Senegal 89-61, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 89-61 in league history.
That makes 89-61 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 90-61 has happened 1 times and 89-62 has happened never.