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Mike Tyson makes a whirlwind start to the bout landing heavy blows on Clifford Etienne right from the first bell

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Tyson shapes to land a powerful looking uppercut as Etienne's head begins to drop

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Etienne lies prone on the canvas as Tyson's stunning punch leaves him out cold

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Tyson graciously helps Etienne to his feet as referee Bill Clancy declares the fight over after just 49 seconds

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Tyson's sixth fastest victory of his career sends a warning to the rest of the heavyweight division

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Etienne looks pained as he congratulates Tyson on a sensational performance which leaves the crowd in Memphis stunned