Almost two years after knocking out Daniel Dubois, Oleksandr Usyk did it again to assert his reign as undisputed heavyweight boxing champion.

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

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