Sugar Ray Leonard fought a who's who of boxing greats, but one stands out clearly when determining who hit the hardest.

The five-weight world champion and Olympic gold medallist broke out onto the world stage during a golden era of boxing in the 1980s.

Along with Thomas Hearns, Marvin Hagler and Roberto Duran, Leonard formed part of the iconic 'Four Kings', a quartet of world-class boxers who competed in and around the middleweight division.

Leonard was the only member of the illustrious group to beat the other three, although he did have to avenge his loss to Duran.

The first time they met in June 1980, Leonard made the ill-advised decision to stand and trade with Duran after the Panamanian puncher got under his skin in the build-up.

It led to a fantastic fight, but one Leonard wo

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