Has a FIBA World Cup game ever ended 77-58?
Exactly once. On February 22, 2019, Turkey beat Slovenia 77-58, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 77-58 in league history.
That makes 77-58 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 78-58 has happened 2 times and 77-59 has happened never.