In the UFC's nearly three decades, there have been a handful of memorable and shocking upsets inside the Octagon.
On Friday, the UFC released a video on its YouTube channel highlighting the fights that stunned the MMA world, including a series of UFC world title changes.
The video begins with what is probably the most shocking result in the history of the campaign defended the welterweight championship against – who deserves his chance The ultimate fighter reality show. Although no one gave the nearly 900-ranked underdog a chance, Serra became world champion in April 2007 with an incredible first-round knockout in the main event of UFC 69.
Additionally, the surprise highlight reel featured the +830 underdog When she quit, she delivered one of the UFC's most legendary knockouts with a brutal headbutt to win the women's bantamweight title in November 2015.
Check out the full list of incredible surprises in the video above.
