Has a FIBA World Cup game ever ended 87-50?
It has. 87-50 has been a FIBA World Cup final 2 times in 2,041 games. The first was Serbia beat Georgia on June 29, 2018; the latest was Lebanon beat Syria on July 1, 2018.
That makes 87-50 the 222nd most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 88-50 has happened never and 87-51 has happened never.