Watch: The contrasting reactions to UFC knockout

McGregor's whole coaching staff erupted in ecstasy after the 27-year-old knocked out Aldo in 13 seconds. Photo / YouTube.

Conor McGregor defeated Jose Aldo in just 13 seconds at Las Vegas' MGM Grand Arena in one of the most thrilling Ultimate Fighting Championship moments of all time.

The Irishman's triumph in UFC 194 on Saturday was the fastest ever knockout in a UFC title fight, and the win was made even more dramatic considering the Brazilian former featherweight champion had not lost in over 10 years.

And a video of the shock on both of the fighters' teams' faces as McGregor sucker punched Aldo with a terrific left is particularly telling of the overwhelming emotions felt by both camps.

McGregor's camp looked slightly more relaxed as the fight got underway, whereas Aldo's backing staff looked a touch more anxious ahead of the bout.

The Dubliner's coach John Kavanagh then opened his mouth in disbelief as his man landed his punch, before the whole coaching set-up erupted in ecstasy after the 27-year-old sent Aldo to the canvas.

As the 29-year-old from Manaus fell to the ground at the famous Nevada venue, Aldo's team looked devastated, with one member - fellow Brazilian mixed martial artist, Marlon Sandro - almost in tears.

To the right of Aldo's team, official Octagon announcer Bruce Buffer simply sat there wide-eyed and aghast with his mouth slightly ajar.

Aldo pulled out two weeks before his last scheduled fight with McGregor in July, citing a rib injury, and perhaps that would have been the wiser move this time around, too.

The UFC 194 card set a new US record gate of $10.1million (£6.67m) and could also break the company's pay-per-view record of around 1.5m buys.

Saturday night's gate at the MGM Grand may have been dwarfed by the $72m achieved by Mayweather and Manny Pacquiao at the same venue last May.

But it has been bettered just 19 times in boxing history - and McGregor is just getting started.