WATCH: All the drama and heart-pounding action rolled into one highlight reel from a historic ONE 168 card in Denver

ONE Championship delivered an exciting night of fights for the promotion's second-ever live event in the United States at ONE 168: Denver on Sept. 6 inside the Ball Arena.

Fans witnessed non-stop action from the best fighters throughout the nine-fight card, which ONE shared the highlights of on Instagram:

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At the top of the card, ONE flyweight kickboxing world champion Superlek Kiatmoo9 ascended to double-champion status with a masterful 49-second knockout of Jonathan Haggerty to win the ONE bantamweight Muay Thai world championship.

Despite the defeat, 'The General' is still a ONE world champion, holding 26 pounds of bantamweight kickboxing gold.

In the co-main event, Muay Thai icons Seksan Or Kwanmuang and Liam Harrison had a barnburner befitting their legendary statuses, which 'The Man Who Yields To No One' ultimately won via TKO in the second round.

Other notable winners at ONE 168: Denver were Turkish MMA star Shamil Erdogan, bantamweight Muay Thai newcomer and former ONE bantamweight MMA world champion John Lineker, lightweight MMA standout Adrian Lee, and blue-chip Muay Thai fighter Johan Ghazali.

Demetrious Johnson retired from MMA at ONE 168: Denver

ONE Championship's thrilling return to the United States also featured Demetrious Johnson's emotional retirement from MMA.

A teary-eyed 'Mighty Mouse' thanked everyone who supported him throughout his championship-laden career, which includes being the only fighter to have won gold in both the UFC and ONE Championship.

After the now-former ONE flyweight MMA world champion's retirement speech, ONE Championship Chairman and CEO Chatri Sityodtong announced him as the inaugural inductee into the ONE Championship Hall of Fame.

Fans in the United States and Canada with an active Prime Video subscription can rewatch ONE 168: Denver via the full fight replay.