The New Zealand fighter has beaten his idol, Brazilian legend Anderson Silva, by unanimous decision in UFC 234 in Melbourne.
The judges have scored the three-round middleweight fight 29-28, 30-27, 30-27 in favour of the man known as 'The Last Style Bender'.
"This is crazy," Adesanya said.
"This is like for a kid just to play, if I'm playing basketball, to play against Michael Jordan.
"This is it for me...and I do it against the best."
The 29-year-old was full of respect for Silva, 43.
"Anderson, thank you, obrigado my friend," he said.
"You've been doing this for a long time and I appreciate you."
American Kevin Gastelum arrived at UFC 234 with the championship belt after the title holder, Australian Robert Whittaker, withdrew from their proposed fight.
"Kevin, put that belt down, seriously," Adesanya barked.
It completes a clean sweep for the three Kiwi fighters and the City Kickboxing gym in Auckland.
Flyweight Kai Kara-France earlier beat another Brazilian, Raulian Paiva, by split decision.
And Shane Young beat American Austin Arnett by unanimous decision in his featherweight bout.
