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.

Oleksandr Usyk has scored a fifth-round knockout of Daniel Dubois to became the undisputed world heavyweight champion for a second time

Oleksandr Usyk knocked out Daniel Dubois to reign as the undisputed heavyweight boxing champion. Round-by-round analysis.