Has a FIBA World Cup game ever ended 65-51?
Exactly once. On February 27, 2022, Tunisia beat Rwanda 65-51, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 65-51 in league history.
That makes 65-51 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 66-51 has happened never and 65-52 has happened 2 times.