Has a FIBA World Cup game ever ended 77-61?
Exactly once. On August 10, 1994, Greece beat China 77-61, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 77-61 in league history.
That makes 77-61 the 240th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 78-61 has happened 1 times and 77-62 has happened 1 times.