Khabib Nurmagomedov was a well-rounded Mixed Martial Arts fighter who has made his name as the greatest lightweight in MMA and one of the most dominant UFC champions of all time. His background in the Russian martial art of sambo made him one hell of a grappler! Basically, once you are on the Octagon floor with Khabib, you are sure to lose. The highlight of Khabib’s career is capturing the UFC lightweight championship belt and defending it four times. His most viewed UFC fight was against Conor McGregor. Actually, UFC 229 was the most viewed fight on Pay-Per-View in UFC history, as there were over 2,400,000 viewers. Likely Khabib’s most challenging opponent was Dustin Poirier. Nurmagomedov retired as the lightweight champion. His overall MMA record is unblemished at 29-0, and he is the only UFC champion who retired undefeated.