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After quitting Chazz Witherspoon in around seven at Chicago oleksandr Usyk won his first fight at heavyweight.
This signifies Ukrainian Usyk, 32, stays the WBOs mandatory challenger to the winner of Anthony Joshuas heavyweight-title rematch with Andy Ruiz Jr..
Usyk had not fought since all four world cruiserweight names were defended by him against Tony Bellew
Witherspoon stood with four days notice after an adverse doping test was returned by original opponent Tyrone Spong.
Usyk was asked if he had been ready to combat the likes of Ruiz, Joshua and WBC winner Deontay Wilder next.
This shows I am prepared to combat them, said the 2012 Olympic champion.
Of course if they give me this battle, I will take it.
Although Ruiz will defend his WBA, WBO and IBF names against Britains Joshua from Diriyah, Saudi Arabia December wilder will protect his belt in a rematch from Luis Ortiz at Las Vegas on 23 November.
Usyk began watchfully from Witherspoon before he started to make it using a run of forceful blows.
He came close to driving a stoppage but Witherspoon held on.
Usyk hunted for a knock-out from the seventh, backing Witherspoon to the corners landing with a flurry of punches and also, even though the American return into his stool after the round finished, he couldnt get up again.
It extends the unbeaten record to 17 wins, 13 of Usyk .
He was due to create his heavyweight advent but had to pull out because of a biceps injury.
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