Mixed martial arts fans spent much of the night, and lots of their hard-earned cash, in anticipation of the weekend's UFC featherweight title bout - only for Irishman Conor McGregor to knock out his opponent Jose Aldo in just 13 seconds.
McGregor pounced on the Brazilian by turning his opponent's righthand lead into a smooth left finisher to the jaw, throwing him cold to the canvas.
The Las Vegas match took place at 5 am UK time, meaning many British fans spent the early hours building excitement for the bout.
Watch the fight in full, above.
And for avid MMA fans, the anticipation meant that McGregor's impressive speed served as a somewhat expensive anti-climax.
“No power, just precision," McGregor told reporters following the fight.
“No speed, just timing. That’s all it takes. These are four-ounce gloves. That’s all it takes.”
McGregor becomes UFC Featherweight champion after Saturday's match held at the MGM Grand in the gambling oasis.
McGregor wrote on Instagram: "To the naked eye it was 13 seconds, but to my team and my family it has been a lifetime of work to get to that 13 seconds."
Conor McGregor v Jose Aldo
APTOPIX UFC 194 Mixed Martial Arts(01 of33)
Conor McGregor knocks out Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
APTOPIX UFC 194 Mixed Martial Arts(02 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
APTOPIX UFC 194 Mixed Martial Arts(03 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
APTOPIX UFC 194 Mixed Martial Arts(04 of33)
Conor McGregor, left, fights Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. McGregor stopped Aldo with one spectacular punch just 13 seconds into the first round Saturday night, backing up his bravado and claiming the undisputed featherweight title at UFC 194 on Saturday night. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(05 of33)
Conor McGregor, left, fights Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(06 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(07 of33)
Jose Aldo prepares before fighting Conor McGregor in a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(08 of33)
Jose Aldo looks on after being defeated by Conor McGregor in a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(09 of33)
Conor McGregor, left, fights Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(10 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(11 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(12 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(13 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(14 of33)
Conor McGregor, left, fights Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(15 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(16 of33)
Jose Aldo looks on after being defeated by Conor McGregor in a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(17 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(18 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(19 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(20 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(21 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(22 of33)
Conor McGregor looks on before fighting Jose Aldo in a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(23 of33)
Conor McGregor warms up before fighting Jose Aldo in a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(24 of33)
Conor McGregor warms up before fighting Jose Aldo in a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(25 of33)
Conor McGregor prepares before fighting Jose Aldo in a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(26 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(27 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(28 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(29 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(30 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(31 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(32 of33)
Conor McGregor reacts after defeating Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194, Saturday, Dec. 12, 2015, in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)
UFC 194 Mixed Martial Arts(33 of33)
Conor McGregor stands on stage during the weigh-in for UFC 194 Friday, Dec. 11, 2015, in Las Vegas. McGregor is scheduled to fight Jose Aldo in a featherweight championship bout Saturday in Las Vegas. (AP Photo/John Locher) (credit:ASSOCIATED PRESS)