Conor Anthony McGregor (born 14 July 1988) is an retired Irish professional mixed martial artist and boxer. He started his career in 2008. He is signed to the Ultimate Fighting Championship (UFC). He is the former UFC Featherweight Champion and UFC Lightweight Champion. He has fought as a featherweight, lightweight and welterweight. He began his boxing career in 2017. He lost to Floyd Mayweather Jr. in his first match. McGregor returned to MMA on 6 October 2018 to regain the Lightweight Championship from Khabib Nurmagomedov but lost via submission.