Chisora to become mandatory challenger 41-year-old British boxer Dereck Chisora is surprised to become mandatory challenger for the first time in his career. The IBF is expected to announce the heavyweight as a challenger for Daniel Dubois' title soon. “Of course, I want my last fight in my career to be a title fight. I got this desire after the IBF decision, which should make me a mandatory challenger. I will become a mandatory challenger for the first time in my career.” “Can you believe it? If I have one fight left, I want it to be this one. I want to please the fans,” Chisora said. The next fight will be the 50th in Chisora's professional career.