Nigeria, Dec. 20 -- Anthony Joshua delivered a sixth-round knockout to end his much-anticipated bout against YouTube star Jake Paul in Miami in grand style.

The Nigerian-born boxer overcame a frustrating start before asserting his class against the novice opponent.

The fight, held at the Kaseya Center and scheduled for eight rounds, saw Joshua, a two-time world heavyweight champion struggle early to impose himself as Paul exceeded expectations by surviving the opening exchanges.

Joshua eventually found the breakthrough with a devastating right hand in the sixth round that left Paul with a broken jaw.

Paul, who had laboured to keep his footing throughout the contest, slumped near the ropes and was unsteady as he attempted to rise, prom...