Derek Chisora vs Deontay Wilder winner could get mandatory shot at Oleksandr Usyk's IBF title, says Frank Warren

Derek Chisora and Deontay Wilder are putting their careers on the line when they fight in April, says promoter Frank Warren.

Former world title challenger Chisora and hard-punching ex-WBC champion Wilder are aged 42 and 40 years old respectively.

Warren believes the loser of their April 4 heavyweight rumble will have to retire.