Anthony Joshua was walking away before his opponent even hit the canvas after thunderous one-punch KO

Anthony Joshua had some serious swagger about him in the ring during his rapid ascendency to boxing superstardom.

In his twelfth professional fight in 2015, Joshua made light work of heavyweight Raphael Zumbano, knocking him out in round two.

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Zumbano had the experience advantage going into the fight, with 47 professional contests under his belt, but it did not look that way on the night.

Joshua looked cool, calm and collected for as long as the fight lasted, stalking Zumbano around the ring.

Halfway through round two, Joshua landed the killer blow, sending Zumbano to the canvas with a crushing right hand.

It was almost as if Joshua knew the fight was over as soon as the punch landed, as he turned and began walking away before Zumbano's body had even thudded on the canvas.

The brave Brazilian attempted to make it back to his feet, but once again fell against the ropes and the referee waved off the contest.

Knocking out opponents in stunning fashion had become so normal for Joshua at this point of his career that he barely even celebrated, simply holding his hand up to the crowd and bowing.

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In the years following this fight, Joshua went on to achieve it all in the heavyweight division, becoming a two-time unified heavyweight world champion.

But, in recent times, Joshua seems to have lost the aggression that made him so dangerous on the come up and he has subsequently suffered losses against Andy Ruiz Jr and Oleksandr Usyk, as well as putting in a lacklustre performance in his victory against Jermaine Franklin last time out.

Next up, Joshua is expected to take on Deontay Wilder as part of a heavyweight tournament that would also feature Tyson Fury vs Usyk, in Saudi Arabia in December.

Joshua will be hoping that if he comes up against Wilder, who is largely considered the hardest puncher in heavyweight history, he can rediscover the form that saw him dispatch of Zumbano in a similar fashion to how he dealt with every opponent back then.