Reinier de Ridder

Reinier de Ridder is a Dutch professional mixed martial artist and judoka. Born September 7, 1990 in Breda, Netherlands, he currently competes in the UFC middleweight division. Known by his initials RdR, de Ridder made his name in ONE Championship, where he became a two-division world champion. He held both the ONE Middleweight and Light Heavyweight titles simultaneously, making him only the third fighter in ONE history to achieve that feat. His grappling-heavy style, rooted in judo and Brazilian jiu-jitsu, has earned him a reputation as one of the most dangerous submission artists in the sport. After a successful title defense against Kiamrian Abbasov, de Ridder suffered losses to Anatoly Malykhin, ending his championship reign. He later transitioned to the UFC, making his debut in 2024. Across his professional career, de Ridder has amassed over 20 fights, with notable wins against top competition. Despite setbacks, de Ridder remains a top contender in the middleweight division, known for his resilience and technical prowess. Standing 6 feet 4 inches tall, he uses his reach and grappling to control opponents. His calm, analytical demeanor outside the cage contrasts with his aggressive style inside. He is currently active in the UFC, with no announced fights as of early 2026. De Ridder continues to train and improve, aiming for a title shot in the near future. His journey from judo prodigy to MMA champion inspires many in the Netherlands and beyond.[edit]

De Ridder grew up in Breda, a city in the southern Netherlands with a strong martial arts culture. He started training in judo at a young age, which became the foundation of his combat sports career. His early upbringing emphasized discipline and technical grappling, and he quickly excelled in judo competitions. Before transitioning to MMA, de Ridder pursued a university education, though specific details about his degree and institution are not widely publicized. His pivotal moment came when he decided to shift from competitive judo to mixed martial arts, recognizing that his grappling skills could translate effectively into the cage. He began training at local Dutch gyms, honing his striking and Brazilian jiu-jitsu to complement his judo base. He made his professional MMA debut in 2013, winning his first fight by submission in regional European promotions. His early career laid the groundwork for his eventual breakthrough in ONE Championship. De Ridder's dedication to martial arts from childhood shaped his path to becoming a champion.[edit]

De Ridder's breakthrough came after signing with ONE Championship in 2018. On October 30, 2020, at ONE: Inside the Matrix, he captured the ONE Middleweight World Championship by submitting Aung La N Sang via rear-naked choke. He then moved up to light heavyweight and defeated La N Sang again at ONE: Full Circle on February 25, 2022, winning the ONE Light Heavyweight World Championship, becoming a two-division champion. He became only the third fighter in ONE history to hold two titles simultaneously. On November 18, 2022, he successfully defended his middleweight title against Kiamrian Abbasov at ONE on Prime Video 4, winning by submission. He suffered his first career loss to Anatoly Malykhin at ONE on Prime Video 10 on May 5, 2023, losing the light heavyweight title. He lost the rematch for the middleweight title at ONE on Prime Video 17 on December 8, 2023, ending his championship reign. In 2024, he signed with the UFC, making his promotional debut on November 9, 2024, at UFC Fight Night, defeating Gerald Meerschaert by submission in the third round. He continued his UFC career with a win against Kevin Holland at UFC Fight Night on February 15, 2025, by submission, establishing himself as a top contender in the middleweight division. After his loss to Malykhin, he said, "Every loss is a lesson. I came back stronger." His notable wins include Aung La N Sang, Kiamrian Abbasov, and Kevin Holland. He has not won mainstream awards, but his championship status in ONE is his primary achievement. He consistently ranked among ONE's top pound-for-pound fighters during his reign. His submission win over Aung La N Sang in 2020 is considered one of the greatest performances in ONE Championship history.[edit]

De Ridder is known for his grappling-heavy, submission-focused fighting style. Media often describes him as a technical, methodical fighter with elite grappling, respected for his humility and professionalism. He has a dedicated fanbase in the Netherlands and among grappling enthusiasts. There is no official fandom name. Fans appreciate his technical mastery and underdog story. On social media, he maintains a professional, respectful voice, focused on training and competition, rarely engaging in trash talk or controversy. He has approximately 150,000-200,000 followers on Instagram and 50,000-100,000 on Twitter/X. His judo throws and ground control are his signature. He is known for his calm, analytical demeanor outside the cage, contrasting with his aggressive grappling inside. He has not appeared on major magazine covers, but is featured in MMA-focused publications.[edit]

Reinier de Ridder commands a loyal following that identifies him primarily as 'The Dutch Knight,' a moniker earned through his historic tenure as a two-division world champion in ONE Championship before his arrival in the UFC. His supporters, often referred to simply by his initials RdR or as general MMA enthusiasts, have rallied behind his technical grappling mastery and his recent narrative pivots. The fanbase operates within the broader combat sports ecosystem rather than as a distinct, named entity with organized rituals or specific campaigns, though they actively engage with his training updates and vlogs on social media platforms. While he lacks a formal fandom name documented in official records, his community celebrates his underdog resilience and his shift from a judo specialist to a versatile mixed martial artist.

In August 2026, the iFANN Global Fame Engine evaluated Reinier de Ridder's standing in the cultural landscape. The evaluation determined that he is currently EVALUATED_UNRANKED, meaning he does not hold a placement in the published Global Top 1,000 or any Top-100 scope list. This absence of a numeric rank reflects his status as a highly respected veteran rather than a mainstream celebrity dominating global search trends at this specific moment. Despite the lack of a formal ranking, his influence remains potent among grappling purists and fans who follow his transition to light heavyweight and his high-profile disputes with figures like Jiri Prochazka.[edit]

De Ridder's initials RdR serve as a ubiquitous shorthand for fans and media alike. He stands out as one of the few athletes to successfully translate elite-level judo into MMA dominance, utilizing throws and trips as his primary takedown arsenal while holding a black belt in Brazilian jiu-jitsu. Outside the cage, he maintains a calm, analytical demeanor that contrasts sharply with his aggressive grappling style inside the octagon. His career timeline spans a 2013 debut, a 2018 signing with ONE Championship, back-to-back title wins in 2020 and 2021, and a subsequent move to the UFC in 2024 where he defeated Kevin Holland in 2025.

A defining chapter of his modern legend involves his public pivot in 2026. After suffering a TKO loss to Brendan Allen, de Ridder announced a permanent move to the light heavyweight division, declaring he would never return to middleweight. That same year, he ignited headlines by engaging in a verbal confrontation with UFC champion Jiri Prochazka, dismissing the champion's 'ninja' persona as a fake personality. Additionally, his switch to American Top Team sparked discussion after he publicly criticized his former training environment, marking a significant evolution in his preparation strategy.[edit]

De Ridger keeps his personal life private. He was born and raised in Breda, Netherlands, but details about his parents and siblings are not publicly documented. He is not known to have children or pets. There is no public information about his current household or family values. He has a background in education, having attended university in the Netherlands, though specific details about his degree and institution are not widely documented.[edit]

De Ridder has notable rivalries with Aung La N Sang, whom he defeated twice to win both ONE titles, and Anatoly Malykhin, who defeated him twice to end his championship reign. He also faced Kiamrian Abbasov in a title defense. In the UFC, he has fought Gerald Meerschaert and Kevin Holland.[edit]

Reinier de Ridder maintains a very private personal life. There is no publicly confirmed dating history, relationships, or marriages reported in credible media sources as of 2026. He has not been linked romantically to any partners in verified reports. As of 2026, he is believed to be single with no public reports of a current partner, spouse, or children. He has not been involved in any publicized romantic relationships.[edit]

Per iFANN's editorial analysis, Reinier de Ridder's net worth is estimated at $2 Million as of 2026. His financial foundation rests on his professional fighting career, encompassing fight purses, win bonuses, and performance incentives. During his reign in ONE Championship, champions typically secured earnings between $50,000 and $100,000 per bout, often supplemented by additional bonuses. Upon entering the UFC, his debut purse was projected around $50,000 to $80,000, reflecting a show and win bonus structure, with expectations for increased compensation as he ascends the rankings. Public records indicate limited endorsement opportunities, likely restricted to local sponsorships within the Netherlands. There is no available information regarding real estate holdings or private investment portfolios. While various speculative estimates range from $1 million to $2 million, the figure of $2 Million represents the current consolidated assessment based on disclosed fight earnings and career trajectory.[edit]

Reinier de Ridder has won two major world championships in ONE Championship: the ONE Middleweight World Championship in 2020 and the ONE Light Heavyweight World Championship in 2021. He became only the third fighter in ONE history to hold two titles simultaneously. He has not won traditional entertainment or sports awards like ESPYs or World MMA Awards.[edit]