Has a FIBA World Cup game ever ended 63-57?
Exactly once. On December 1, 2018, Cameroon beat Morocco 63-57, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 63-57 in league history.
That makes 63-57 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 64-57 has happened 1 times and 63-58 has happened 1 times.