Vitor Belfort nearly sent Las Vegas bookies into a panic attack when he secured an armbar on champion Jon Jones on Saturday night. With Jones coming into the fight as an 8:1 favorite, anyone who dropped a courtesy bet on Belfort almost cleaned up.
Unfortunately for fans of The Phenom, Jones was able to escape the deep submission and pull out the victory only three rounds later. Some betting favorites weren't so lucky.
Here is a look at the biggest upsets from UFC 152, power ranked based on betting odds at fight time.
At one time, Evan Dunham was considered to be the hottest prospect in the UFC lightweight division. Slick submissions plus a solid chin and well-rounded kickboxing highlighted his skill set and made him a talent to watch.
Meeting T.J. Grant on the undercard, Dunham was nearly a 2:1 favorite in who would ultimately win Fight of the Night honors. Unfortunately for the Xtreme Couture fighter, he was not favored by the judges on Saturday night.
Grant pulled out the unanimous decision, which included a curious 30-27 from one judge who must have lost his vision prior to the fight's beginning.
Perhaps oddsmakers underestimated the skills of Kyle Noke. Maybe the curly locks of Charlie Brenneman clouded their vision.
Whatever the cause, Noke was offered to fight fans with a line of +190 for his 45-second pillaging of the wrestler. The bout marked Noke's return to welterweight after an extended run at 185 pounds.
This win stopped a two-fight skid for Noke who had lost bouts with Andrew Craig and Ed Herman.
Opening at -260, Charles Oliveira was given a 62 percent chance of victory from oddsmakers. Apparently, nobody told Cub Swanson that he was supposed to lose.
Do Bronx was considered to be a dark horse in the featherweight division, and had hopes of becoming the youngest champion in UFC history.
Needing only half of a round, Swanson recorded his third consecutive TKO when he dropped the Brazilian with a straight right to the temple.
The odds were stacked against Demetrious Johnson as soon as the brackets for the UFC Flyweight championship were revealed. In the first round, he would battle Ian McCall, a man who was the world's top flyweight before the UFC created a 125-pound division.
Defeating McCall in a two-bout series, he would also see tough competition in the next round. In the tournament final, Mighty Mouse saw his opponent with a -285 line.
Winning a split decision, Johnson will now go down in history as the first flyweight champion of the UFC.
Jimy Hettes is one of the top prospects in the featherweight division. Great judo, solid counter-striking and a chin that never quits are qualities that helped him dominate Nam Phan last December.
After a split decision victory against Maximo Blanco in April, Marcus Brimage was expected to be little more than the next victim for Hettes. Jimy the Kid entered this bout at a whopped -500 betting line.
Brimage used power striking to do damage, but his most impressive moments came while defending the dangerous submissions of Hettes.