The biggest UFC upsets prove that no result is certain in the octagon. In 2019, UFC events drew huge appeal because anyone can pull off an upset on the right night. Skilled MMA fighters spend their lives training for upcoming fights, and even the biggest underdog can deliver a shocking KO after months of high-level preparation. This feature showcases the UFC's best upsets in its long history. Fans were stunned by the results in real time, with many betters losing money on favorites that got knocked out by underdogs. The unpredictability of UFC is highlighted by these knockouts. Vote for the results that surprised you the most and help decide which fight had the biggest upset in UFC history.
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Matt Serra Vs. George St. Pierre in the Biggest UFC Upsets.: UFC 69
Date: April 7, 2007Matt Serra won the knockout against George St. Pierre with brutal punches, pulling off the upset.
13 - 2
Holly Holm Vs. Ronda Rousey in the Biggest UFC Upsets.: UFC 193
Date: November 14, 2015Holly Holm knocked out the unbeatable Ronda Rousey, ending Rousey's streak. Fans reacted to the Holm knockout victory.
10 - 3
Chris Weidman Vs. Anderson Silva in the Biggest UFC Upsets.: UFC 162
Date: July 6, 2013Chris Weidman shocked fans by knocking out Anderson Silva with brutal punches during his incredible run.
8 - 4
Michael Bisping Vs. Luke Rockhold in the Biggest UFC Upsets.: UFC 199
Date: June 4, 2016Michael Bisping added to his record by beating the heavy favorite Luke Rockhold at UFC 199.
7 - 5
Nate Diaz Vs. Conor McGregor in the Biggest UFC Upsets.: UFC 196
Date: March 5, 2016Nate Diaz humbled Conor McGregor using the rear naked choke for the submission.
6 - 6
T.J. Dillashaw Vs. Renan Barao in the Biggest UFC Upsets.: UFC 173
Date: May 24, 2014T.J. Dillashaw earned a huge upset win at UFC 173 with a headkick and punches, securing the best moment.
4 - 7
Rose Namajunas Vs. Joanna Jedrzejczyk in the Biggest UFC Upsets.: UFC 217
Date: November 4, 2017Rose Namajunas dominated with a knockout, showing the women's division allows upsets.
4 - 8
Jens Pulver Vs. BJ Penn in the Biggest UFC Upsets.: UFC 35
Date: January 11, 2002Jens Pulver defeated the legendary BJ Penn by decision at UFC 35, establishing his name.
4 - 9
Frankie Edgar Vs. BJ Penn in the Biggest UFC Upsets.: UFC 112
Date: April 10, 2010Frankie Edgar defeated BJ Penn by decision, shocking expectations for Matt Hughes at UFC 46.
3 - 10
Antonio Silva Vs. Alistair Overeem in the Biggest UFC Upsets.: UFC 156
Date: February 3, 2013Antonio Silva scored a knockout at UFC 156, ruining Alistair Overeem's expected easy win.
3 - 11
Rashad Evans Vs. Chuck Liddell in the Biggest UFC Upsets.: UFC 88
Date: September 6, 2008Rashad Evans upset Chuck Liddell at UFC 88, surprising the betting public.
3 - 12
Joe Lauzon Vs. Jens Pulver in the Biggest UFC Upsets.: UFC 63
Date: September 23, 2006Joe Lauzon proved an upset is one knockout away with his great win at UFC 63.
2 - 13
Henry Cejudo Vs. Demetrious Johnson in the Biggest UFC Upsets.: UFC 227
Date: August 5, 2018Henry Cejudo shocked fans by defeating the favorite Demetrious Johnson by decision.
2 - 14
Johny Hendricks Vs. Jon Fitch in the Biggest UFC Upsets.: UFC 141
Date: December 31, 2011Johny Hendricks got a shocking 12-second knockout win over Jon Fitch in 2011.
2 - 15
Gabriel Gonzaga Vs. Mirko Filipovic in the Biggest UFC Upsets.: UFC 70
Date: April 21, 2007Gabriel Gonzaga scored a shocking knockout win, taking away the mystique from Mirko Filipovic.
1 - 16
Forrest Griffin Vs. Mauricio Rua in the Biggest UFC Upsets.: UFC 76
Date: September 22, 2007Forrest Griffin won the submission victory over Mauricio Rua using a rear naked choke.
1 - 17
Randy Couture vs Tim Sylvia in the Biggest UFC Upsets.: UFC 68
Date: March 3, 2007Randy Couture pulled off the upset victory against Tim Sylvia by unanimous decision, size not mattering.
1 - 18
BJ Penn vs Matt Hughes in the Biggest UFC Upsets.: UFC 46
Date: January 31, 2004BJ Penn shocked the world at UFC 46 with a submission victory, against expectations of Matt Hughes.
1 - 19
Mike Russow Vs. Todd Duffee in the Biggest UFC Upsets.: UFC 114
Date: May 29, 2010Mike Russow stole the show at UFC 114, knocking out the more established Todd Duffee.
1 - 20
Tito Ortiz Vs. Ryan Bader in the Biggest UFC Upsets.: UFC 132
DateJuly 2, 2011Tito Ortiz used a vintage performance to defeat Ryan Bader by submission on the big stage.
0 - 21
Keith Jardine Vs. Chuck Liddell is listed in the Biggest UFC Upsets.: UFC 76
Date: September 22, 2007Keith Jardine had a career night. Chuck Liddell and the UFC viewers were shocked. Jardine won the UFC 76 fight with the split decision going his way.
0 - 22
Junior Dos Santos Vs. Fabricio Werdum is listed in the Biggest UFC Upsets.: UFC 90
Date: October 25, 2008Junior dos Santos showed the underdog can win. He got an impressive knockout victory over Fabricio Werdum.
0 - 23
Randy Couture Vs. Chuck Liddell is listed in the Biggest UFC Upsets.: UFC 43
Date: June 6, 2003Randy Couture pulled off the upset win in his first fight against Chuck Liddell, a top-tier victory in his career.
0 - 24
Forrest Griffin Vs. Quinton Jackson is listed in the Biggest UFC Upsets.: UFC 86
Date: July 5, 2008Forrest Griffin defeated Rampage Jackson in a surprising way. A unanimous decision ended Jackson's time on top.
0 - 25
Frank Mir Vs. Antonio Rodrigo Nogueira is listed in the Biggest UFC Upsets.: UFC 92
Date: December 27, 2008Frank Mir pulled off upsets. His most impressive win was knocking out Antonio Rodrigo Nogueira.
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