UFC legend Jon Jones would still have an unbeaten record if he wasn't controversially disqualified in his 2009 fight against Matt Hamill.
Jones, 35, holds a professional record of 26 wins, one loss, and one no-contest but is widely considered unbeaten by fans because of the nature of his lone defeat. In just his third UFC appearance, 'Bones' was disqualified against Hamill despite dominating the fight after landing a series of '12-6' elbows, an illegal technique that bans the use of striking downward using the point of the elbow.
The history of the banned technique remains a grey area and dates back to when the unified rules of MMA were first written over 20 years ago. It's believed that commissioners banned the technique after watching traditional martial artists break objects such as bricks with downward elbows, which led to officials deeming the technique too dangerous for MMA.