WATCH: Superlek's slicing elbow leaves Walter Goncalves staring at the roof of the Singapore Indoor Stadium 

Superlek Kiatmoo9 may be the ONE flyweight kickboxing world champion, but you simply cannot underestimate him when it comes to Muay Thai either.

The man they call 'The Kicking Machine' is one of the most ferocious strikers in the world today with flawless technique, ruthless power, and cast-iron toughness.

Back at ONE on Prime Video 1, he showed just how dangerous he can be with every strike that he throws.

The Thai competitor came up against Brazil's Walter Goncalves in the semi-final of the ONE Flyweight Muay Thai World Grand Prix Championship and made quick work of his opponent.

A beautiful left elbow strike ended the bout in just over 90 seconds after Goncalves was not able to make it back up to his feet from the knockdown.

This fight once again showed that whilst he may be a phenomenal technician of the striking arts, you cannot afford to sleep on how dangerous he is at all times.

Check out the incredible finish of this fight from way back in 2022:

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Superlek is a threat at all times and Jonathan Haggerty knows that

Superlek lives and breathes for big fights, but in his next outing at ONE 168: Denver, they simply don't get much bigger.

The flyweight kickboxing world champion is set to move up a weight class to challenge Jonathan Haggerty for the bantamweight Muay Thai world championship.

Haggerty, who was defeated by Superlek many years ago outside of ONE Championship, knows the dangers that his opponent presents.

Navigating all of them to try and come away with the win on September 6 might just go down as the biggest challenge that 'The General' has ever faced.

He's got his work cut out from him at ONE's return to the United States but if there's anyone that won't be intimidated, it's the confident two-sport world champion.

ONE 168: Denver will air live from the Ball Arena in U.S. primetime on September 6