#4 Jose Aldo
Never in the history of the Ultimate Fighting Championship has a fighter got inside the head of his opponent as badly as Conor did with Jose Aldo.
The Irishman wound Aldo up so much to the point where by the time their fight came around, Aldo was a shadow of his former self. If you need any evidence of that, just go back and watch the clash itself.
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You can see it on YouTube - most likely because it lasts no more than 15 seconds.
Conor connected on a devastating shot that ensured the fight lasted less time than it takes to get up and walk into your kitchen. After all of the build-up and all of the hype, this was an unbelievably impressive statement for McGregor to make against the Brazilian.
Now to a man who actually fought in place of Jose on short notice.