Conor McGregor’s Most Notorious Knockouts

Victim: Ivan Buchinger, Dec. 31, 2012

Before coming to the UFC, McGregor held two Cage Warrior Fighting Championship (CWFC) belts in the featherweight and lightweight divisions. He won the then-vacant lightweight belt against Ivan Buchinger with a left hook that collapsed his foe into a heap.

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Victim: Marcus Brimage, Apr. 6, 2013

McGregor made a statement in his debut against Marcus Brimage when The Notorious landed an onslaught of precise punches and kicks before finishing off “the Bama Beast” with what would become his signature left.

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Victim: Dustin Poirier, Sept. 27, 2014 

McGregor predicted his main event fight would end with a Round 1 KO, and he delivered. “The Diamond” did a face-plant 1:46 into the first round after McGregor knocked Poirier down and finished him with nasty hammer strikes.

Victim: Chad Mendes, July 11, 2015

Chad Mendes took the fight on two weeks notice and lost in two rounds after being smashed with a straight left hand that forced him into a ball on the ground.

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Victim: Jose Aldo, Dec. 12, 2015

It was one of the most anticipated fights in UFC history, and it lasted all of 13 seconds. McGregor dropped Aldo with a perfectly timed left hook, catapulting the Irishman into UFC’s elite.