Has a FIBA World Cup game ever ended 60-55?
Exactly once. On August 2, 1998, Japan beat Senegal 60-55, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 60-55 in league history.
That makes 60-55 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 61-55 has happened never and 60-56 has happened never.