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If Terence Crawford is able to defeat Errol Spence Jr. – particularly if he does it convincingly – he’ll have his defining victory.      Related StoriesErrol Spence Jr. showdown gives Terence Crawford opportunity to prove he's truly an all-time great | Opinion - EnclosureAlex Pereira: 'If anyone has a chance against Israel Adesanya, it's Sean Strickland'Errol Spence Jr. vs. Terence Crawford: 5 burning questions heading into boxing superfight