Thomas "The Hitman" Hearns

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Pryor also called out Hearns but they never fought, not sure if Hearns avoided him though.

Hagler, Hearns and Leonard all avoided Mike McCallum according to McCallum himself.

Duran was the one obligated to fight McCallum as Mike was the mandatory, but Duran had much more lucrative bouts with Hagler and Hearns. That led to a falling out between Steward and McCallum, as the Bodysnatcher was a Kronk fighter back then.

As in the case with Leonard/Pryor, I don't thing Hagler had an obligation to fight McCallum. A champ has no obligation to fight a champ/contender in a lower weight class. It's good if they do and it creates a good matchup, but there's no obligation. They are obligated to fight the best fighters in their own division.