The final UFC PPV event for 2021 did not disappoint in Las Vegas over the weekend.
There was no shortage of drama or epic finishes including a submission win in the Main Event as Charles Oliveira defended his UFC Lightweight title for the first time against Dustin Poirier.
But if we needed any proof that this sport is unpredictable, the woman who many have called the Greatest Of All Time, Amanda Nunes, lost via submission in the second round to Julianna Pena in a massive upset.
It’s not the first, and won’t be the last, time that we see a huge underdog shocking the world in a UFC fight.
It’s a huge part of the reason why we love this sport.
We’ve completed our homework and listed The Biggest Upsets In UFC History below.
Julianna Pena def Amanda Nunes at UFC 269
Amanda Nunes is the only fighter in UFC history to defend two belts in two different weight classes at the same time.
No one can take that away from her.
Just like many of her previous fights, the majority of those predicting the outcome gave little chance to her opponent Julianna Pena including the bookmakers.
Pena was $6.25 head to head, $15 to win by submission and $51 to win by sub in the second round.
Pandemonium ensued when Pena stood toe to toe with the champ and after getting the better of the exchanges, sunk in a read naked choke in the second round.
— SportsCenter (@SportsCenter) December 12, 2021
Matt Serra def George’s St-Pierre at UFC 69
George St-Pierre was one of the most dominant champions that the UFC has had and has gone down as one of the greatest the sport has ever seen.
The Canadian had one loss to his name, to Matt Hughes, when he was defending his UFC Welterweight title for the first time against Matt Serra who was given no chance by anyone.
He was a puncher’s chance at best and he landed those punches and shocked the world, and himself.
GSP forced a rematch just over a year later, won back his belt and never lost again.
Holy Holm def Ronda Rousey at UFC 193
Ronda Rousey had 12 wins from 12 professional fights heading into her seventh UFC title defence against Holy Holm.
She had been out of the first round only once, against Meisha Tate.
She was unbeatable.
Or so we thought.
In front of the largest crowd ever assembled for a UFC event in Melbourne, Holy Holm proved the world wrong when she head kicked Rousey to claim the UFC Bantamweight crown.
It was the first time that Rousey had faced an accomplished striker and it proved her downfall, losing by TKO in the second round.
Rose Namajunas def Joanna Jedrzejczyk at UFC 217
You could have claimed as much as $7.00 about Namajunas when she won the UFC Strawweight title from Joanna Jedrzejczyk in New York back in November 2017.
Jedrzejczyk was undefeated in 14 professional fights leading into that fight including five defences in the division.
The odds seems crazy with hindsight especially considering Namajunas went on to beat Joanna with her next fight over five rounds.
Joanna was outspoken, aggressive and arrogant leading into their first encounter.
Oh how this sport can humble.
Michael Bisping def Luke Rockhold at UFC 216
It’s not as if Michael Bisping didn’t have any credentials leading into his UFC Middleweight title fight with Luke Rockhold at UFC 216.
He was on a three fight winning streak including a decision win over arguably the most dominant champion we have ever seen in Anderson Silva.
Rockhold was originally set to face Chris Weidman however he pulled out through injury and Bisping stepped in off just 17 days notice.
He’d also lost to Rockhold earlier in his career.
This is why the punters thought he could not win.
He conceived, he believed, and he achieved via a first round KO that sent the MMA world into chaos.
Fabricio Werdum def Cain Velasquez at UFC 188
Just looking at the data, It’s hard to believe that an interim champion could be a $5 underdog but that was the case when Fabricio Werdum faced Cain Velasquez at UFC 188 in June 2015.
The two were the inaugural coaches of The Ultimate Fighter: Latin America but after Velasquez pulled out due to a knee injury, Werdum won the Interim title against Mark Hunt.
When the fight eventually happened in Mexico City, Werdum won by third round guillotine.
Nate Diaz v Conor McGregor 1 at UFC 196
Nate Diaz wasn’t surprised but those putting money on his fight against Conor Mcgregor were.
He’d lost three of his last five fights leading into the biggest challenge of his career, and he had just 11 days notice to prepare but in true Diaz style he was up for it.
Bookies were offering as much as $5.00 for Diaz to win the fight in head to head betting.
The fight took place at Welterweight and Diaz won via submission in round two.
His name was etched in UFC folklore and his already bright star gained some extra wattage because of this win and subsequent rematch.