While Conor McGregor is a champion fighter, he has faced a series of ups and downs inside - and outside - the Octagon. The Ultimate Fighting Championship (UFC) star began his impressive mixed martial career in 2008 and was signed to the professional league in 2013. Throughout his reign in the UFC, McGregor has collected a series of accolades including the UFC Featherweight Championship, UFC Lightweight Championship, Fight of the Night, Knockout of the Night and more. Three years after his debut, McGregor lost his first match against challenger Nate Diaz in March 2016.