OLEKSANDR USYK has transformed his body to weigh in as a heavyweight for the first time.
The undefeated Ukrainian steps up from cruiserweight against Chazz Witherspoon in Chicago on Sunday and has beefed up for the bout.
Usyk swept aside all comers in the cruiserweight division.
He hoovered up the WBA, IBF, WBC and WBO belts within two years before he put them all on the line for his last fight against Tony Bellew last November.
The 32-year-old was due to fight Carlos Takam in his heavyweight debut in May but had to pull out with a bicep injury.
Usyk has piled an more than a stone in his bid to fight at heavyweight and currently weighs in at 15st 5lb.
Despite the impressive gain Usyk still ranks as one of the lightest men in the division.
Anthony Joshua tips the scales at 17st 9lb while Tyson Fury and Deontay Wilder are 18st 2lb and 15st 13lb respectively.
Usyk's opponent on Sunday will have a two stone advantage over the Ukranian having weighed in at 17st 4lb.
Usyk's heavyweight debut will be shown on Sky Sports Action on Sunday at 2am.
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