Mike Tyson believes size will play a massive factor in who emerges victorious between Canelo Alvarez and Terence Crawford.

The pound-for-pound titans are set to square off on September 13 at Las Vegas' Allegiant Stadium in the biggest American boxing bout of the year.

Crawford is set to move up two divisions to challenge Canelo for his undisputed super middleweight crown without the aid of a rehydration clause.

Canelo, a natural 168lber, has boxed as high as light heavyweight (175lbs), while Crawford made his super welterweight debut (154lbs) last year after stints at lightweight (135lbs), super lightweight (140lbs) and welterweight (147lbs).

Due to the considerable weight disparity between the pair, Tyson struggles to see Crawford getting his hand raised, even if he remains hopefu

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