1. Conor McGregor
McGregor’s inclusion on this list may appear bizarre because of his achievements. As a former two-weight UFC champion, the Irishman became the biggest name in combat sports. Meanwhile, he made a sensational amount of money after a boxing match with Floyd Mayweather. However, ‘The Notorious’ squandered his talent over the next couple of years as he allowed fame and money to go to his head.
The Dubliner has endured many high-profile legal problems over the past number of years. Furthermore, his love of partying and the high-life has affected his motivation. While McGregor’s influence on MMA is undeniable, his legacy will not be what it could have been. There is time for the former champion to reclaim his place at the top of the heap but fans will never consider him the best.