Why they rank here
The biggest star the sport has ever produced, McGregor changed MMA's economics and reach while backing it up in the cage during his prime. He became the first fighter to hold two UFC titles simultaneously, knocking out featherweight king José Aldo in a record 13 seconds at UFC 194 in 2015 and stopping Eddie Alvarez for the lightweight belt at UFC 205 in 2016. His left hand was one of the most feared weapons in the sport, and his self-promotion filled arenas and drove the two biggest pay-per-views in company history. He also crossed into boxing for a blockbuster loss to Floyd Mayweather in 2017. Injuries, inactivity and losses to Nate Diaz and Khabib Nurmagomedov, plus a leg break against Dustin Poirier in 2021, clouded his later years. He sits around 22-6, but his peak dominance and cultural impact are undeniable.
Career profile
Each bar shows how this athlete compares with the strongest in our all-time list for that metric.