He won with fifth - round knockout .
Bush became the ISKA # 1 world contender after knocking out then current # 1 contender Paul Biafore in Toronto , Ontario , Canada in 1987 .
Bush won with fifth - round knockout .
Bush became the ISKA # 1 world contender after knocking out then current # 1 contender Paul Biafore in Toronto , Ontario , Canada in 1987 .