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.

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

I t's been nearly two years since Oleksandr Usyk and Daniel Dubois first met in the ring, on a night that tested both men differently. Since then, both have elevated their positio