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Oleksandr Usyks first bout at the heavyweight division is in jeopardy after an adverse doping test was returned by Saturdays rival Tyrone Spong, says promoter Eddie Hearn.
Usyk, 32, amassed all of four world titles in cruiserweight and his move up a branch has been highly anticipated.
But Surinamese-Dutch fighter Spongs position is in doubt after Voluntary Anti-Doping Association (Vada) testing.
Weve reserve opponents standing , tweeted Hearn.
Weve been contacted by Vada to inform us that there has been a negative finding in Tyrone Spongs evaluation. It has been delivered into the State of Illinois commission.
Hearn said there will be an upgrade on Tuesday.
Usyk is scheduled to confront Spong at Chicagos Wintrust Arena within his first departure when he defended all four world cruiserweight names.
Spong, 34, competed before winning his first 14 battles as a boxer in kickboxing and spent much of his combat career.
Vada requires promoters or fighters to pay for testing for the duration of a struggle build-up and works in MMA and boxing. It stated Spong was part of its testing programme on 20 September.
Even the Las Vegas-based Vada has been responsible for evaluations which resulted in the likes of American heavyweight Jarrell Miller and has earned a glowing reputation in boxing along with also Mexicos SaulCanelo Alvarez facing bans for doping in the last few decades.
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