Has a FIBA World Cup game ever ended 101-50?
Exactly once. On February 26, 2018, Italy beat Romania 101-50, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 101-50 in league history.
That makes 101-50 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 102-50 has happened never and 101-51 has happened never.