This Saturday, Khalil Rountree tries to surprise and end Alex Poatan's reign at light heavyweight.
Let's remember some cases of challengers who entered as 'zebras', but broke the bank and left with the belt.
After being knocked out on the first attempt, Henry Cejudo arrived as a big underdog for his rematch against the dominant Demetrious Johnson, but left with the belt.
(1,20) Demetrious Johnson x Henry Cejudo (4,80)
Whoever bet R$100 on Cejudo won R$480.
The first Brazilian on the list, Rafael dos Anjos was seen as a 'zebra' in the duel against Anthony Pettis, but he dominated the then champion and took the lightweight title.
(1,20) Anthony Pettis x Rafael dos Anjos (5,00)
Whoever bet R$100 on the Brazilian won R$500.
Few expected that, in the final stretch of his career, Michael Bisping would become UFC champion. The 'Count', however, knocked out Luke Rockhold, broke the bank and took the middleweight belt.
(1,17) Luke Rockhold x Michael Bisping (5,50)
Whoever bet R$100 on the Brit took R$550.
Joanna Jedrzejczyk had her overwhelming favoritism broken and ended up being knocked out and dethroned by Rose Namajunas in 2017.
(1,14) Joanna Jedrzejczyk x Rose Namajunas (6,00)
Whoever bet R$100 on the North American took home R$600.
The latest underdog on the list, Alexa Grasso ended, albeit temporarily, Valentina Shevchenko's flyweight reign with a submission at UFC 285.
(1,11) Valentina Shevchenko x Alexa Grasso (6,75)
Whoever bet R$100 on the Mexican won R$675.
Record holder for lightweight belt defenses, BJ Penn was a huge favorite at UFC 112, but ended up surprised and defeated by the 'zebra' Frankie Edgar.
(1,11) BJ Penn x Frankie Edgar (6,88)
Whoever bet R$100 on Edgar won R$688.
At UFC 173, for the bantamweight belt, Dillashaw shocked the world by knocking out Brazilian Renan Barão, who hadn't lost in an incredible 33 fights.
(1,10) Renan Barão x TJ Dillashaw (7,50)
Whoever bet R$100 on the North American took home R$750.
Opening our podium, at UFC 269, Julianna Peña won the bantamweight belt by submitting 'Lione' Amanda Nunes in the third biggest upset in the history of UFC title fights.
(1,09) Amanda Nunes x Julianna Peña (8,00)
Whoever bet R$100 on the North American took home R$800.
Second place in the ranking goes to Holly Holm, who finished off the 'phenomenon' Ronda Rousey with a historic knockout at UFC 193.
(1,07) Ronda Rousey x Holly Holm (9,30)
Whoever bet R$100 on "The Pastor's Daughter" took home R$930.
The title of greatest underdog in history goes to Matt Serra, who left the world 'open-mouthed' when he knocked out Georges St-Pierre at UFC 69, breaking a favoritism of more than '9 to 1'.
(1,08) Georges St-Pierre x Matt Serra (9,50)
Whoever bet R$100 on the North American took home R$950.