BBC Sport looks at where Oleksandr Usyk ranks among the all-time heavyweight greats and who in the current generation could beat him.

Oleksandr Usyk noqueó a Daniel Dubois en el quinto asalto de su combate del sábado y se convirtió en el campeón mundial indiscutido de los pesados por

LONDON -- Oleksandr Usyk knocked out Daniel Dubois in the fifth round and became the undisputed world heavyweight champion for a second time on Saturday. The undefeated southpaw retained his WBA, WBC and WBO belts and regained the IBF belt he relinquished just over a year ago.

Promoter Frank Warren says Oleksandr Usyk is a "once-in-a-generation" fighter after he beats Daniel Dubois to become a two-time undisputed heavyweight champion.

The Ukranian's demolition of Daniel Dubois was further evidence of why he should be considered the best heavyweight fighter since Lennox Lewis

The boxing world is set for another epic showdown when Oleksandr Usyk and Daniel Dubois meet in the much-anticipated rematch on Saturday, July 19.

More than a dozen war veterans from Ukraine were on hand when Oleksandr Usyk faced Daniel Dubois at Wembley Stadium on Saturday night and Usyk become the undisputed world heavyweight champion.

Oleksandr Usyk has now laid waste to a generation of top tier British undisputed heavyweight hopes in Tyson Fury, Anthony Joshua and Daniel Dubois.