Ketlen Vieira Bio
Ketlen Vieira da Silva, born on 26 August 1991 in Manaus, Amazonas, Brazil, is a professional mixed martial artist competing in the women’s Bantamweight division of the Ultimate Fighting Championship (UFC). Competing under the ring name Fenômeno, she is widely recognized for her well-rounded grappling base and high fight IQ. As of 4 November 2025, she is ranked #4 in the UFC women’s bantamweight rankings, cementing her status as one of the top contenders in her weight class.
Vieira began her professional MMA career in 2014 and has since built a record of 15 wins and 5 losses across 20 total bouts. She holds black belts in both Brazilian Jiu-Jitsu and Judo, and she has also earned recognition as a decorated wrestler with multiple Brazilian national wrestling titles. Training out of Team Feitosa and Nova União Manaus, she continues to be a consistent presence near the top of her division.
Early Life and Background
Vieira was born and raised in Manaus, Amazonas, Brazil, where she developed an early interest in combat sports. She began training Brazilian Jiu-Jitsu as a young girl and, at the age of twelve, expanded her training by taking up Judo. Her dedication to both grappling arts allowed her to eventually earn black belts in each discipline, forming the foundation of her fighting style.
In addition to her grappling credentials, Vieira became a decorated wrestler, winning multiple titles including a Brazilian national wrestling championship. She enrolled at the University Nilton Lins to study law, but ultimately chose to leave her studies behind in order to pursue a full-time career in mixed martial arts. This decision reflected her commitment to competition and her desire to test her skills at the highest levels of the sport.
Growing up surrounded by a strong martial arts culture in Amazonas, Vieira transitioned to MMA and began training under Marcinho Pontes, the Nova União Manaus coach known for his early work with José Aldo. This environment helped shape her technical base and introduced her to the structured training routines that would later define her professional career.
Path to MMA
Vieira made her professional MMA debut on 2 October 2014 at Circuito de Lutas: Fight Night 4 in São Paulo, where she faced Juliana Leite and earned a second-round knockout victory. The win marked the beginning of a rapid rise through the regional Brazilian circuit, as she captured her next five fights under the Mr. Cage and Big Way Fight Night banners. During this run, she claimed the Mr. Cage bantamweight title, signaling her arrival as a serious prospect.
Within just 17 months of her debut, Vieira had compiled an undefeated 6–0 record, a streak that attracted the attention of the UFC. Her combination of regional titles, finishing ability, and grappling pedigree made her a sought-after signing. By the time she joined the UFC roster in 2016, she had already established herself as one of Brazil’s most promising female bantamweight talents.
Ketlen Vieira Career
Early Career (2014–2016)
Vieira’s early professional career unfolded entirely in Brazil, where she built her reputation on the strength of her grappling and finishing instincts. Her debut victory over Juliana Leite was followed by a string of wins that showcased her ability to end fights both by submission and on the scorecards. These early performances laid the groundwork for her signing to a major international promotion.
Winning the Mr. Cage bantamweight title further validated her skill set, and her undefeated run drew the attention of UFC scouts. By the end of 2016, Vieira had firmly established herself as one of the top regional female bantamweights in the country.
UFC Breakthrough (2016–2018)
Vieira made her UFC debut on 1 October 2016 at UFC Fight Night 96 in Portland, Oregon, where she faced Kelly Faszholz. She earned a split decision victory, though she later spoke publicly about the challenges of cutting weight while also fulfilling United States Anti-Doping Agency (USADA) testing requirements. Less than six months later, on 15 April 2017, she took on Ashlee Evans-Smith at UFC on Fox 24 and won by unanimous decision, with scorecards of 29–28, 30–27, and 29–28.
Her most decisive early UFC win came on 9 September 2017 at UFC 215, where she defeated Sara McMann via arm-triangle choke submission in the second round. A bout against Germaine de Randamie was scheduled for February 2018 but was cancelled due to a hand injury, and Vieira instead faced Cat Zingano on 3 March 2018 at UFC 222, earning a split decision victory. These performances pushed her into the upper tier of the bantamweight division.
Setbacks and Resurgence (2019–2021)
Vieira’s first significant UFC setback came on 14 December 2019 at UFC 245, when she was knocked out in the first round by Irene Aldana. A series of cancellations, rescheduled bouts, and injury withdrawals followed, including a planned bout against Tonya Evinger that was scrapped due to a knee injury, and a rescheduled fight with Yana Kunitskaya in 2021 that ended in a unanimous decision loss after she missed weight.
She rebounded later in 2021, defeating Sijara Eubanks by unanimous decision at UFC 253 in a rescheduled bout, and then outpointing former champion Miesha Tate in the main event of UFC Fight Night 198 on 20 November 2021. These wins helped her regain momentum inside the bantamweight division.
Late Career and Title Contention (2022–2025)
On 21 May 2022, at UFC Fight Night 206, Vieira earned a controversial split decision victory over former champion Holly Holm, a result that drew debate, as 18 out of 20 media outlets scored the bout in Holm’s favor. She then dropped a split decision to Raquel Pennington on 14 January 2023 at UFC Fight Night 217, before bouncing back with a unanimous decision win over Pannie Kianzad on 22 July 2023 at UFC Fight Night 224.
A scheduled bout with Macy Chiasson in January 2024 was scrapped due to a Vieira injury, and she went on to face 2019 and 2021 PFL Women’s Lightweight Champion Kayla Harrison at UFC 307 on 5 October 2024, losing by unanimous decision. On 31 May 2025, at UFC on ESPN 68, Vieira met Chiasson in a bout that was moved to featherweight on the day of weigh-ins due to her weight management issues; she won by unanimous decision. On 1 November 2025, at UFC Fight Night 263, she lost a split decision to Norma Dumont, a result that 6 out of 7 media outlets scored in her favor.
Driving Style and Strengths
Vieira is widely regarded as a grappling-first fighter whose black belts in Brazilian Jiu-Jitsu and Judo give her a sharp edge in clinch exchanges and ground control. Her ability to mix wrestling with positional grappling allows her to dictate where fights take place, while her growing striking game has made her a more complete and unpredictable competitor in recent years.
Notable Events and Milestones
Among her signature UFC moments are her second-round arm-triangle submission of Sara McMann at UFC 215, her main event win over former champion Miesha Tate at UFC Fight Night 198, and her upset split decision over Holly Holm. She is also recognized as the former Mr. Cage bantamweight champion and is currently ranked among the top five women in the UFC bantamweight division.
Ketlen Vieira Career Wins
Vieira has accumulated 15 professional victories across her MMA career, with finishes split between submissions, knockouts, and decisions. Her wins have come against a deep roster of opponents, including a former UFC champion, a former title challenger, and several ranked contenders.
UFC Highlights
Inside the UFC, Vieira has earned notable wins over Kelly Faszholz, Ashlee Evans-Smith, Sara McMann, Cat Zingano, Sijara Eubanks, Miesha Tate, Holly Holm, Pannie Kianzad, and Macy Chiasson. Her win over Chiasson in May 2025 is her most recent victory, while her first UFC win came by split decision over Faszholz in 2016.
Other Wins and Performances
Before joining the UFC, Vieira went 6–0 on the Brazilian regional circuit, capturing the Mr. Cage bantamweight title along the way. Her professional debut knockout of Juliana Leite in 2014 marked the start of a career defined by consistent winning and steady improvement against increasingly tough opposition.
Ketlen Vieira Family
Family Background and Racing Lineage
Details about Vieira’s immediate family and any racing-style martial arts lineage are not widely documented in available sources. She is closely associated with the Nova União Manaus gym and Team Feitosa, where she has trained and developed her career.
Personal Life
Vieira resides in Manaus, Amazonas, Brazil, the same city where she was born and where she continues to train. She is known publicly by the ring name Fenômeno. Further details about her marital status, children, and other personal relationships are not clearly supported by available sources.
2025 Season Performance
Vieira’s 2025 campaign began with a delayed return to action, as a scheduled bout with Macy Chiasson in February was removed from the card after Chiasson suffered an injury. The two were rebooked for 31 May at UFC on ESPN 68, where the bout was shifted to featherweight on the day of weigh-ins due to weight management issues from Vieira, who forfeited 25% of her purse. Despite the disruption, Vieira emerged with a unanimous decision victory.
She followed that win with a close split decision loss to Norma Dumont on 1 November at UFC Fight Night 263, in a result that was widely disputed; six of seven media outlets scored the fight for Vieira. Heading into the final stretch of the year, she remains a fixture in the upper half of the women’s bantamweight rankings.
Currently ranked #4 in the UFC women’s bantamweight division, Vieira continues to position herself as a potential title contender in the near future. With her grappling pedigree, evolving striking, and experience against elite competition, her outlook in the division remains strong as the next calendar year approaches.