Oleksandr Usyk weighed this weekend.
Usyk will measure upward on Sunday at 2am, live on Sky Sports Main Event.
The undefeated Allied washed up at the 200lbs branch in the space of two decades, including that the WBA and IBF titles to his WBC and WBO straps on his 15th fight before placing all four straps on the line from Tony Bellew in his last outing in November.
Usyk, that was made to postpone his heavyweight debut following a bicep injury scuppered a struggle with Carlos Takam in May, inserted just over a stone for his first battle at November after tipping the scales in 215lbs (15 stone, 5lbs).
Witherspoon (38-3, KOs 23) stepped in at late notice to replace Tyrone Spong andThe Gentleman will have a weight gain of almost two stone after coming in at 242lbs.
The set left hands ahead of their showdown and stare down before they separated.
Dmitry Bivol weighed 174.3pounds ahead of his WBA light-heavyweight name defence together with Lenin Castilo making 175lbs.
WBA and WBA super-lightweight Jessica McCaskill has been 138.7pounds ahead of her domain name rematch with Erica Farias at 138.1lbs.