Has a FIBA World Cup game ever ended 78-77?
Yes. FIBA World Cup has seen a final score of 78-77 3 times. It first happened on July 15, 1986, when Spain beat Cuba, and most recently on August 27, 2006, when Germany beat Nigeria.
That makes 78-77 the 26th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 79-77 has happened 4 times and 78-78 has happened never. Nearly all of its occurrences fall between 1980 and 2009.