Mir delivers knockout blow

The two-time former heavyweight champion secured his second KO victory in as many fights, needing just one punch to down Duffee.

The fight got off to a frantic start, with both men wielding their fists early on, despite Mir's tendency to start slowly and then work his way into a fight.

Duffee landed two solid blows, but he had no answer when a left hook from Mir connected with his jaw and left him sprawled on the canvas. 

Referee John McCarthy jumped in, and time was called on the bout with 1:13 on the first round clock.