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Earlier, Lisburn's Kurt Walker tasted defeat for the first time as he was outpointed by Liam Davies in their battle for the vacant IBF International featherweight title.

WBA, WBC, WBO and IBF champion Alvarez becomes the fourth male boxer to become a two-time undisputed champion in the four-belt era, joining Crawford, Oleksandr Usyk and Naoya Inoue.

Alvarez was stripped of the IBF belt instead of facing Scull last year but once again becomes the king of the super-middleweight division.

The bout against Scull will give Álvarez a chance to regain the IBF crown.

When asked if Dubois had improved since their last fight two years ago, Usyk told BBC Sport: "I think he has, Daniel wins the IBF belt, has beaten three good fighters. He is a world champion, a hard man, a dangerous man."