Heavyweight A first-generation American who inherited his relentless work ethic from his Mexican father, Cain Velasquez stands atop of the UFC’s biggest division like a colossus. Up to 265 lbs Cain Velasquez
Light Heavyweight As the most successful UFC light heavyweight champion of all time, Jon Jones, the middle brother of star NFL defensive linemen Arthur and Chandler, not only has bragging rights in his family, but also a claim to being the greatest fighter in the world. Up to 205 lbs Jon Jones
Middleweight As a two-time All-American Division I wrestler and BJJ brown belt under Matt Serra, Chris Weidman was already one of the most feared competitors in the middleweight class – even before he started knocking out the division’s elite. Up to 185 lbs Chris Weidman
Welterweight The pride of Montreal, Georges St-Pierre began training in martial arts at the age of six after begging his father for lessons to help deal with a schoolyard bully. Up to 170 lbs Georges St-Pierre
Lightweight Capable of devastating aerial attacks where he literally runs up the side of the Octagon in order to fling himself into flying kicks or knees, Anthony “Showtime” Pettis has begun to look unbeatable as he moves towards his mid-20s. Up to 155 lbs Anthony Pettis
Featherweight Once so poor his trainers had to check that he’d eaten before allowing him into the gym, Jose Aldo has risen to become the greatest featherweight in MMA history. Up to 145 lbs José Aldo
Bantamweight While some of Dominick Cruz pound-for-pound peers might be a little quicker or have a more powerful punch, not one of them can boast the tactical genius of the reigning UFC bantamweight champion. Up to 135 lbs Dominick Cruz
Flyweight "Mighty Mouse” was already an outstanding bantamweight contender despite fighting significantly larger men, but it was when the UFC created a 125lbs division that the world really got to see just how good Demetrious Johnson is. Up to 125 lbs Demetrious Johnson
Women - Bantamweight Turning pro in March 2011, two-time judo Olympian Ronda Rousey told her mother that she’d try mixed martial arts for a year and see if anything happened for her. Up to 135 lbs Ronda Rousey