He beat Eddie Alvarez at UFC 205 to become the first mixed martial artist to simultaneously hold world titles in two different weight divisions.
It was a superb performance and cemented the Irishman’s already solid reputation as the UFC’s biggest star.
You can re-live how it happened right here, but this is how the internet reacted to McGregor’s incredible night.
ATP World Tour Finals 2016: Andy Murray beats Marin Cilic in London
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