Has a FIBA World Cup game ever ended 103-88?
Exactly once. On August 14, 1990, Greece beat Brazil 103-88, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 103-88 in league history.
That makes 103-88 the 240th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 104-88 has happened never and 103-89 has happened never.