Has a FIBA World Cup game ever ended 73-50?
Exactly once. On July 1, 2018, Lithuania beat Hungary 73-50, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 73-50 in league history.
That makes 73-50 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 74-50 has happened never and 73-51 has happened 1 times.