The ans is - Ken Buchanan
What boxer challenged Jack Dempsey in 1923 for the world heavyweight title, in what boxing historian Bert Sugar described as the greatest fight in the history of the sport?
Which boxer held the World Welterweight title from the end of 1946 to 1951, at which point he then won the World Middleweight title?
In 2001 John Ruiz became the first Latin American to win the title of World Boxing Association World Heavyweight Champion. From whom did he win the title?
