Oleksandr Usyk, with his characteristic pragmatism, shut down any questions over whether he can motivate himself to keep going after a knockout win over Daniel Dubois on Saturday helped him reclaim the undisputed heavyweight boxing crown.
The Ukrainian put in a scintillating performance as he floored Briton Dubois in the fifth round at Wembley Stadium to add the IBF belt to his WBC, WBA and WBO titles.
Asked how he
