The 15 Biggest UFC Events Of All Time!

4. UFC 264: McGregor vs. Poirier III

Conor McGregor. Photo: Gary A. Vasquez-USA TODAY Sports

• Where: T-Mobile Arena, Las Vegas
• When: July 11, 2021
• PPV buys: 1,504,737

With one stoppage win each after two fights, the third clash between rivals Conor McGregor and Dustin Poirier was supposed to be the grand finale.

However, the fight ended with a big ’what if’, as McGregor broke his leg in the last seconds of the first round and ”The Diamond” got the win via TKO (doctor stoppage).