 In what international contest did Howard David Jr. defeat the undisputed heavyweight boxing champion of 1978?
Howard Davis Jr.:  He was also awarded the Val Barker Trophy at the Olympics, beating out such boxers as Sugar Ray Leonard, Michael Spinks and Leon Spinks. Leon Spinks:  In only his eighth professional fight, he won the undisputed heavyweight championship in 1978 after defeating Muhammad Ali via split decision, in what was considered one of the biggest upsets in boxing history.
the Olympics