Alex Oliveira is a Brazilian professional mixed martial artist who competed in the Welterweight division of the Ultimate Fighting Championship (UFC) from 2015 to 2022.
You can follow Alex Oliveira’s biography, career details, relationship status, net worth, contract, fight purses, records, achievements, and more here.
Alex Oliveira’s Biography
| Detail | Information |
| Full Name | Alex Oliveira |
| Nickname | Cowboy |
| Birth Date | February 21, 1988 |
| Height | 5’11” (180.34 cm) |
| Weight | 170 lbs (77.11 kg) |
| Birthplace | Três Rios, Rio de Janeiro, Brazil |
| Nationality | Brazilian |
| Turned Professional | 2011 |
| Current Net Worth | $5 million |
| Relationship Status | Married |
| Wife | Mariana Cassiano |
| Instagram Profile | @alexcowboyoficial |
Alex Oliveira was born on February 21, 1988, in Três Rios, Rio de Janeiro, Brazil. He grew up in a large family with three brothers and four sisters. Tragically, two of his brothers lost their lives due to violent crime.
Before pursuing a career in mixed martial arts, Oliveira worked as a construction worker and bull rider. He began training in Muay Thai for a couple of years before transitioning to MMA at the age of 22.
Professional Career
Oliveira made his professional MMA debut in December 2011, competing in the welterweight division. He fought exclusively in regional promotions in Brazil, including a two-fight stint with Bitetti Combat.
Alex Oliveira signed with the UFC in early 2015. He made his promotional debut as a short-notice replacement against Gilbert Burns on March 21, 2015, at UFC Fight Night 62. Despite a strong start, Oliveira lost the fight via submission in the third round.
Throughout his UFC career, Oliveira faced notable opponents such as Donald Cerrone, Carlos Condit, and Yancy Medeiros. His fight against Medeiros at UFC 218 was named ESPN’s Fight of the Year.
Oliveira’s UFC tenure lasted from 2015 to 2022, during which he earned three Performance of the Night and two Fight of the Night bonuses. After his contract expired in April 2022, the UFC opted not to re-sign him.
Relationship Status
Oliveira has had multiple relationships and is reported to have 10 children from various partners. His marital status is listed as “Married”.
In May 2019, there was an incident involving Oliveira and a woman described as his wife or ex-wife. He was accused of domestic violence. The name of the woman involved in the 2019 incident is Mariana Cassiano.
Alex Oliveira’s Net Worth Details
Alex Oliveira’s net worth is estimated to be $5 million as of 2025. This figure is based on his career earnings from fight purses, bonuses, and potential endorsements.
Contract
In April 2022, it was announced that Oliveira was a free agent when his UFC contract expired and the UFC opted not to re-sign him.
Oliveira’s contract expired after his last UFC fight, which was a loss to Kevin Holland at UFC 272 on March 5, 2022. That marked Oliveira’s fourth straight defeat, and the UFC decided not to offer him a new contract.
Fight Purses
| Event | Earnings |
| UFC 248 | $143,000 (including $64,000 to show, $64,000 win bonus) |
| UFC Debut (vs. Gilbert Burns) | $8,000 |
Fight Records
| Statistic | Value |
| Total Fights | 41 |
| Wins | 25 |
| Losses | 15 |
| Draws | 1 |
| Wins by KO/TKO | 15 |
| Wins by Submission | 5 |
| Wins by Decision | 5 |
Achievements
- Three-time UFC Performance of the Night bonus winner
- Two-time UFC Fight of the Night bonus winner
- ESPN Fight of the Year (2017) vs. Yancy Medeiros
- 10 first-round finishes in professional MMA career
FAQs
What is Alex Oliveira’s nickname?
Alex Oliveira is known as “Cowboy”.
When did Alex Oliveira make his UFC debut?
Oliveira made his UFC debut on March 21, 2015.
How many Performance of the Night bonuses has Oliveira won in the UFC?
Oliveira has won three Performance of the Night bonuses in the UFC.
What is Alex Oliveira’s fighting style?
He is known for his aggressive striking and grappling skills.
Where does Alex Oliveira train?
Oliveira trains at ATS (André Tadeu Silva) gym in Brazil.
What was Oliveira’s profession before becoming an MMA fighter?
Before MMA, he worked as a construction worker and bull rider.
How many siblings does Alex Oliveira have?
Oliveira has three brothers (two deceased) and four sisters.
What was Oliveira’s record before joining the UFC?
Before joining the UFC, Oliveira had a record of 11-2-1 (1 NC).
When did Oliveira leave the UFC?
His UFC contract expired in April 2022, and he was not re-signed.
What is Alex Oliveira’s most notable fight?
His fight against Yancy Medeiros at UFC 218 was named ESPN’s Fight of the Year.
