Has a FIBA World Cup game ever ended 100-64?
Exactly once. On November 29, 2021, Iran beat Bahrain 100-64, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 100-64 in league history.
That makes 100-64 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 101-64 has happened never and 100-65 has happened never.