Canelo Alvarez faces his biggest challenge since Dmitry Bivol. Alvarez, once again fighting before Mexican Independence Day, defends his undisputed super middleweight crown against Terence Crawford. It all goes down on Saturday night from Allegiant Stadium -- the first combat event to take place at the venue.

Crawford moves up two weight classes in a rare opportunity to dethrone his fellow pound-for-pound great. Should Crawford do the unthinkable, he'll be the first three-division undisputed boxing champion in the four-belt era, an achievement buoyed by the fact that he's also the first two-weight class undisputed champ of this era. Crawford relishes the opportunity to "shut everyone up" and achieve a historic feat.

CBS Sports will also have live coverage of the fight with

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