Conor McGregor claimed the featherweight title by knocking out Jose Aldo after just 13 seconds at UFC 194 in Las Vegas.
The Irishman floored the long-time champion with a superb left hand with his first connecting punch to secure the fastest-ever knockout in a UFC title fight.
“Precision beats power, timing beats speed,” McGregor said afterwards.
“I feel for Jose. He’s a phenomenal champion. He deserved to go a little bit longer.”
It was also Brazilian Aldo’s first defeat in 10 years after winning 18 straight fights.
McGregor (27) boasted in the build-up to the fight that he would “embarrass” Aldo with a first-round knockout.
And he backed up his confident prediction with a devastating punch shortly after the start of the fight.
Looking ahead, McGregor said: “The options are there now. Frankie [Edgar] had a good win, that could be for the featherweight belt, maybe the Jose rematch or maybe the 155lb strap.
“We will wait and see, but there are options.”