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After Saturdays opponent Tyrone Spong returned an doping test, oleksandr Usyks first bout at the division is in jeopardy, says promoter Eddie Hearn.
32, usyk, amassed all four world titles at cruiserweight and his move up a branch has been anticipated.
However, Surinamese-Dutch fighter Spongs place is in doubt after Voluntary Anti-Doping Association (Vada) testing.
We have book opponents standing by, tweeted Hearn.
We have been contacted by Vada to inform us that there has been an adverse finding in Tyrone Spongs evaluation. Its been sent to the State of Illinois commission.
Hearn said therell be an update on Tuesday.
When he defended all of four world cruiserweight titles usyk is scheduled to confront Spong at Chicagos Wintrust Arena in his first departure since quitting Britains Tony Bellew in November.
Spong spent much of his combat career in mixed martial arts and also competed before winning his first 14 battles as a boxer in kickboxing.
Vada requires fighters or promoters to pay for testing for the length of a fight build-up and functions in MMA and boxing. It stated Spong was a part of its testing programme in 20 September.
Even the Las Vegas-based Vada has earned a reputation in boxing and was responsible for evaluations which resulted in the likes of American Jarrell Miller and Mexicos SaulCanelo Alvarez facing bans for doping in late years.
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