If not gsp vs serra, whos your biggesest upset in ufc history..

[Mmmmmmma1234]

Silva vs Overeem is up there too the reem was on such a tear killing everyone including Silva for two rounds. But there is the whole no horse meat made reem a little soft there.

 

[STAY GOLD]

Gongazga/CC

This has to be it when you put into context. Cro Cop had built a reputation for himself in PRIDE around his brutal head kick KO's. Gonzaga was an opponent they set for him to put that on display. Gonzaga was a BJJ practitioner primarily who had never head kick KO'd anyone previously so that entire outcome was completely unexpected.

 

[Ibm]

Anderson vs Weidman

 

[octagonation]

Rockhold vs Bisping 2

Pena vs Nunez

 

[Dana's Moonface]

I'm cheating, but Andy Ruiz beating Joshua
Francis pushing Fury to the brink with many believing he won

Also Nate beating conor. Its easy to sat he had the right attributes in hindsight, but conor was on a tear and nate had 11 days to prepare

 

[Dana's Moonface]

Penn beating Hughes for me
No social media back then and although I knew Penn was crazy talented ,Hughes was such a beast and just looked too strong for me. I was a bit shocked at the time

One of the true great wins of the sport and was at at time when I was becoming a real fan

 

[Dbreiden83080]

I was 100% convinced that my beloved Shogun would destroy that upstart Jon Jones. That upset me for a week. I cried.

I’ll bet. That was as nasty a beat down as anyone has ever seen in the sport. And you knew 20 seconds in that Jones was going to destroy him. He opened up with that flying knee, and then a brutal takedown.

 

[Dbreiden83080]

Penn beating Hughes for me
No social media back then and although I knew Penn was crazy talented ,Hughes was such a beast and just looked too strong for me. I was a bit shocked at the time

One of the true great wins of the sport and was at at time when I was becoming a real fan

BJ was always a horrible matchup for Matt Hughes. Because Matt just has terrible striking. BJ obviously had very good boxing, and the amazing ground game. I believe that second fight that one was short notice for BJ and even then he gave Matt hell before gassing out.

 

[El Fernas]

Rousey vs Holm is probably the answer (odds wise)
Nunes vs Peña is a very good honorable mention.

 

[Rommy2020]

Peña beating Nunes I’d say.