Anthony Joshua wrought knockout chaos upon Francis Ngannou, obliterating the crossover MMA superstar on his second visit to a boxing ring with a second-round knockout.

Ngannou shocked the world when he floored undefeated WBC champion Tyson Fury on his boxing debut last October and a slot opened up to face Joshua when Deontay Wilder was beaten by Joseph Parker in December.

Parker defeated Zhilei Zhang in the co-main event on Friday, going a sometimes arduous 12 rounds. By contrast, Joshua got his work done in quick time.

Ngannou started promisingly, landing his long left hook but a switch to southpaw showed a touch of overconfidence and Joshua detonated a huge right hand to send him crashing to the canvas towards the end of round one.

Joshua wasted no time in closing the show, clattering Ngannou with his backhand after jabbing to body and head. The former UFC heavyweight champion rose groggily, only to be brutally dispatched by a single, chilling right hand that left him out cold.