The 12 Biggest Upsets in MMA History

Some of these results still get argued about a decade later, and a couple of them ended a career on the spot.

1

Holly Holm beats Ronda Rousey

Holm ended the sport's biggest unbeaten run with a second-round head kick at UFC 193 in November 2015.

2

Matt Serra beats Georges St-Pierre

A reality-show winner and heavy underdog stopped the welterweight champion in the first round at UFC 69.

3

Chris Weidman beats Anderson Silva

Silva clowned his way into a left hook at UFC 162, ending the longest title reign in UFC history.

4

Fabricio Werdum beats Fedor Emelianenko

A triangle-armbar in under two minutes ended Fedor's decade-long unbeaten streak in 2010.

5

Julianna Pena beats Amanda Nunes

Pena took a beating, then choked out the pound-for-pound queen in round two at UFC 269.

6

Leon Edwards beats Kamaru Usman

Losing on the cards with a minute left, Edwards landed a head kick that took the welterweight belt.

7

Michael Bisping beats Luke Rockhold

Called up on seventeen days' notice, Bisping knocked out the champion and finally won a belt at 37.

8

Renan Barao loses to TJ Dillashaw

Dillashaw walked in as a 10-1 underdog and battered the pound-for-pound favourite for five rounds.

9

Holly Holm loses to Miesha Tate

Tate survived five rounds of striking to choke Holm unconscious and take the belt at UFC 196.

10

Kevin Randleman beats Mirko Cro Cop

Randleman flattened the feared striker in twenty seconds at Pride Total Elimination 2004.

11

Antonio Rodrigo Nogueira beats Tim Sylvia

Beaten up for a round and a half, Nogueira found a guillotine to win the interim heavyweight title.

12

Sean Strickland beats Israel Adesanya

A 5-1 underdog dropped the middleweight champion in round one and out-boxed him for the belt.