Conor McGregor earned his first UFC belt when he defeated Chad Mendes at UFC 189 for the interim featherweight title.
The PPV card, with a gate of $7.2 million set a new UFC record at the time, for live gate revenue in the United States.
The main event was supposed to feature McGregor vs seven-time defending champion Jose Aldo for the undisputed crown, but Aldo withdrew 11 days from the fight after suffering a rib injury in his hometown.
The change in style of opponent went from an explosive striker to a compact wrestler.
The fight ended when McGregor caught Mendes with a strong left hand sending him to the canvas, before finishing him with some ground and pound, in the final moments of the second round.
Conor McGregor takes on Nate Diaz in a rematch on August 20 at UFC 202.