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Britain's Lawrence Okolie retained his world cruiserweight title with a comfortable third-round knockout of Dilan Prasovic.
Fighting on the Joshua-Usyk undercard, Okolie floored the Montenegrin with a punishing right hand in the second round, before a left-hand body shot finished the contest in the third.
It was the unbeaten 28-year-old's 17th victory and his 14th by knockout.
Earlier Callum Smith beat Lenin Castillo, also by knockout.
Liverpudlian Smith claimed a second-round win in his first fight at light-heavyweight.
Castillo left the ring on a stretcher and the 33-year-old Dominican was taken to hospital as a precaution.
More to follow.