Roberto Satoshi Souza

is a Japanese-Brazilian mixed martial artist who competes in the Lightweight division of Rizin Fighting Federation, where he is a former Rizin Lightweight champion.

Background Roberto Satoshi de Souza was born on September 19, 1989, in Sao Paulo, Brazil to a Brazilian father and Japanese mother and began practicing martial arts with his father at a young age, starting with Judo and later progressing to Jiu-Jitsu. He quickly gained success in the junior divisions of BJJ, winning multiple championships including the World Championship in both his weight category and the open weight category. However, after 2006, the World Jiu-Jitsu Championship was held in California, US and Roberto struggled to secure sponsorships to compete abroad, leading to a temporary absence from the sport. He returned in 2009 and had a successful run for the world title. Roberto later visited Japan to see his brother Mauricio, who had opened an academy there, and decided to stay permanently. To make ends meet, he worked in factories before eventually being able to make a living through competing and teaching Jiu-Jitsu. On May 1, 2011, Roberto received his black belt from his father, Adilson de Souza, who died from an illness shortly after the ceremony.

He is married to a fellow Japanese Brazilian, Yuri Suzuki de Souza, and has two daughters.

On December 2, 2007, Satoshi participated in the DEEP X 02 Real King Tournament in the 76 kg class, winning the championship after defeating Takayuki Muramatsu, Kei Ouchi, and Sotaro Yamada in successive rounds.

In June 2009 and 2010, Satoshi won the World Jiu-Jitsu Championship in the purple and brown belt Lightweight categories, respectively.

On October 10, 2010, the subject participated in the DEEP X 06 Brazilian Jiu-Jitsu Super Tournament in the 75 kg class, defeating three black belt holders, Kei Ochi, Tetsuya Kondo, and Koji Shimazaki to win the championship.

In May 2011, Satoshi was awarded a black belt in Brazilian Jiu-Jitsu by their father.

In April 2012, Satoshi won the gold medals at the Abu Dhabi World Professional Jiu-Jitsu Championship in the black belt Lightweight, defeating Davi Ramos and Lucas Lepri.

Facing Jake Shields on November 22, 2014, at Metamorphis 5, Satoshi drew with Shields as time expired, before returning at Metamoris 6 on May 9, 2015, where he faced Clark Gracie and drew once again due to time expiration.

In June 2017, the subject faced Lucas Lepri in the World Jiu-Jitsu Championship black belt lightweight final, but withdrew due to a shoulder injury and finished as runner-up.

On June 9, 2018, Satoshi participated in QUINTET FIGHT NIGHT in TOKYO as part of "TEAM HALEO", defeating Daisuke Nakamura, David Garmo, and Yoshihiko Matsumoto before going to a timed daw with Masahiro Iwasaki. On October 5, 2018, the subject participated in QUINTET.3 as part of "TEAM SAKURABA", drawing with Gordon Ryan of TEAM ALPHA MALE.

Mixed martial arts career He made his mixed martial arts debut on October 20, 2013, at the Real Fight MMA Championship 3 in China, before winning his sophomore performance against Doo Je Jung in December 2014 via rear-naked choke. On December 5, 2015, he faced Ryuki Ueyama in the first round of the REAL.3 super lightweight (74.2 kg) throne decision tournament, winning by arm-triangle choke. On March 12, 2016, he faced Yuta Kaneko in the semi-finals of the REAL.4 Super Lightweight Championship Tournament and won by TKO via ground and pound. On June 12, 2016, he faced Pat Ayuyu in the final of the REAL Super Lightweight Tournament, successfully winning the title and the tournament via first round armbar submission.

Rizin Fighting Federation After winning two bouts under the Arzalet banner via first round rear-naked chokes, Satoshi made his Rizin FF debut on April 21, 2019, when he faced Satoru Kitaoka at Rizin 15, winning by TKO in the second round via ground and pound.

On July 28, 2019, he faced Mizuto Hirota at Rizin 17 and won by knockout in the first round. During his post-fight mic performance , he yelled, "This is not UFC, this is RIZIN! "

On October 12, 2019, he faced Johnny Case in the Lightweight Grand Prix Quarterfinal at Rizin 19. He received an eye-poke in his left eye, and was tapped out 75 seconds after the start of the match. It was the first loss of his career.

On August 9, 2020, he faced Yusuke Yaji at Rizin 22 and won by first round TKO stoppage.

Satoshi faced Kazuki Tokudome at Rizin 27 on March 21, 2021. After getting taken down, he quickly submitted Tokudome via triangle choke in the first round.

On June 13, 2021, he faced RIZIN Lightweight World Grand Prix Champion Tofiq Musayev for the inaugural Rizin Lightweight Championship at Rizin 28 . In the 1st round, he won the ippon with a triangular choke and succeeded in winning his first title. During the national anthem before the bout, he chose Kimigayo instead of the Brazilian national anthem.

On December 31, 2021, he rematched the challenger Yusuke Yaji in the RIZIN lightweight title match at Rizin 33. He made his first successful defense of the throne .

On April 17, 2022, in the RIZIN lightweight title match of Rizin 35, he rematched the challenger Johnny Case for the first time in about two and a half years, and won in the first round via reverse triangle armbar. Succeeded in his revenge and successfully defended the title for the second time.

Satoshi faced former Bellator Featherweight World Champion A. J. McKee in a non-title bout at Bellator MMA vs. Rizin on December 31, 2022. Although there were many submission attempts made by de Souza, McKee had more offense and won the bout by unanimous decision.

Satoshi faced Spike Carlyle in a non-title bout at Rizin 42 on May 6, 2023. He won the fight by unanimous decision.

Replacing an injured A.J. McKee, de Souza faced former Bellator Lightweight World Champion Patricky Pitbull in the Bellator Lightweight World Grand Prix Quarter-Final as part of Bellator MMA x Rizin 2 on July 30, 2023. He lost the bout by a leg kick technical knockout.

Satoshi fought Keita Nakamura in a non-title bout in the main event of RIZIN Landmark 9 on March 23, 2024. He won the fight by corner stoppage in the first round after dropping Nakamura with a head kick.

Souza defended the RIZIN FF lightweight title against Luiz Gustavo at RIZIN 48 on September 29, 2024. He won the bout via technical knockout 21 second into the first round.

Souza defended the RIZIN FF lightweight title against former Rizin Featherweight Champion Vugar Karamov at Rizin 49 on December 31, 2024. He won the bout via triangle choke submission in the first round.

Souza faced Ki Won-bin in a non-title bout at Rizin World Series in Korea on May 31, 2025, and won via technical submission in the first round.

Souza defended the RIZIN lightweight title against Yoshinori Horie at Rizin 51 on September 28, 2025. He won the bout via submission in the first round.

Souza faced Ilkhom Nozimov at Rizin: Shiwasu no Cho Tsuwamono Matsuri on December 31, 2025. He lost the title by KO in the first round.

Souza is scheduled to face Shunta Nomura on September 10, 2026 at Super Rizin 5.

Championships and accomplishments

Mixed martial arts Rizin Fighting Federation Rizin Lightweight Championship (One time) Five successful title defenses Real Fight Championship RFC Super Lightweight Champship

Mixed martial arts record Loss

Ilkhom Nozimov KO (knee) Rizin: Shiwasu no Cho Tsuwamono Matsuri

Saitama, Japan Win

Yoshinori Horie Submission (rear-naked choke) Rizin 51

Nagoya, Japan Win

Ki Won-bin Technical Submission (rear-naked choke) Rizin World Series in Korea

Incheon, South Korea Win

Vugar Karamov Submission (triangle choke) Rizin 49

Saitama, Japan Win

Luiz Gustavo TKO (punches) Rizin 48

Saitama, Japan Win

Keita Nakamura TKO (corner stoppage) Rizin Landmark 9

Kobe, Japan Loss

Patricky Pitbull TKO (leg kick) Bellator MMA x Rizin 2

Saitama, Japan Win

Spike Carlyle Decision (unanimous) Rizin 42

Tokyo, Japan Loss

A. J. McKee Decision (unanimous) Bellator MMA vs. Rizin

Saitama, Japan Win

Johnny Case Submission (reverse triangle armbar) Rizin 35

Chōfu, Japan Win

Yusuke Yachi Submission (triangle choke) Rizin 33

Saitama, Japan Win

Tofiq Musayev Submission (triangle choke) Rizin 28

Tokyo, Japan Win

Kazuki Tokudome Submission (triangle choke) Rizin 27

Nagoya, Japan Win

Yusuke Yachi TKO (punches) Rizin 22

Yokohama, Japan Loss

Johnny Case TKO (punch) Rizin 19

Osaka, Japan Win

Mizuto Hirota KO (punches) Rizin 17

Tokyo, Japan Win

Satoru Kitaoka TKO (punches) Rizin 15

Yokohama, Japan Win

Baek Seung-dae Submission (rear-naked choke) Arzalet Fighting 4

Seoul, South Korea Win

Thiago Oliveira Submission (rear-naked choke) Arzalet Fighting 2

Curitiba, Brazil Win

Pat Ayuyu Submission (armbar) Real Fight Championship 5

Tokyo, Japan Win

Yuta Kaneko TKO (punches) Real Fight Championship 4

Tokyo, Japan Win

Ryuki Ueyama Submission (arm-triangle choke) Real Fight Championship 3

Yokohama, Japan Win

Jung Doo-je Submission (rear-naked choke) Real Fight Championship 1

Tokyo, Japan Win

Nuerla Murati Submission (rear-naked choke) Real Fight MMA Championship 3

Beijing, China