Oleksandr Usyk is set to make his heavyweight debut on Saturday in Chicago
Oleksandr Usyk’s first heavyweight fight against Tyrone Spong on Saturday is in doubt after promoter Eddie Hearn revealed the Ukrainian’s opponent has returned an adverse doping test.
Unbeaten Usyk is due to begin his pursuit of dominance in another division this weekend, live on Sky Sports, after becoming undisputed cruiserweight champion.
Tyrone Spong has returned an adverse doping test ahead of his fight with Usyk
But his opponent for his first heavyweight bout in Chicago is in jeopardy after testing by the Voluntary Anti-Doping Association (VADA).