In 2017, he participated in one of the biggest combat sports events ever, a boxing match against Floyd Mayweather Jr., which generated over 5 million buys. 2. Major Controversies and Legal Issues

He defeated long-time champion José Aldo in just 13 seconds at UFC 194, the fastest finish in UFC title fight history.

McGregor has headlined the six highest-selling UFC pay-per-view events, including his record-breaking fight against Khabib Nurmagomedov (2.4 million buys).

Report: Conor McGregor — The "Bad Boy" of MMA Conor McGregor , famously known as "The Notorious," is as much defined by his historic achievements in the Octagon as he is by a turbulent history of legal battles and public controversies. This report outlines the dual nature of his career: a meteoric rise to global superstardom followed by a series of incidents that have cemented his reputation as the "bad boy" of combat sports. 1. Historic Athletic Achievements