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Reinier de Ridder
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Reinier de Ridder
Reinier de Ridder (born September 7, 1990), also known by his initials RdR, is a Dutch professional mixed martial artist. He currently competes in the Middleweight division of the Ultimate Fighting Championship (UFC). He previously competed in ONE Championship, where he is a former ONE Middleweight World Champion and ONE Light Heavyweight World Champion. De Ridder was the third two-division champion in ONE history, having previously held the middleweight and light heavyweight belts simultaneously. As of October 21, 2025, he is #8 in the UFC middleweight rankings.
Reinier de Ridder started with Judo at the age of six and earned a black belt in his teens. After high school he began training in Brazilian Jiu-Jitsu while attending college and became a black belt. He also owns a physical therapy clinic in Breda, combining his working hours with his training hours.
De Ridder won a silver medal at the European Jiu-Jitsu Championship in 2016.
De Ridder returned to submission grappling competition at ONE X on March 26, 2022 against André Galvão. The match went the distance and as the promotion did not use judges for their submission grappling matches at the time, it was declared a draw.
De Ridder faced Tye Ruotolo in a submission grappling superfight at ONE Fight Night 10 on May 5, 2023. He lost the match by a close decision.
De Ridder had his first amateur fight in 2013, winning by first round submission, before making his professional MMA debut later that year, winning with a first round triangle choke. Reinier went on a seven fight winning streak with all the fights ending with stoppages. After this winning streak, Reinier got the opportunity to fight for his the Middleweight belt in HIT FC, which he won by first round rear-naked choke. After winning his next bout in under two minutes, Reinier got offers from the UFC and ONE FC, deciding to go with the latter due to better terms.
De Ridder made his ONE debut at ONE: Hero's Ascent on January 25, 2019 against Fan Rong, in a fight which he won by a first round submission. He would then face Gilberto Galvao at ONE: Legendary Quest, knocking out Galvao in the second round with knees, and former title contender Leandro Ataides at ONE: Warrior's Code, in which he won a hard fought decision.
De Ridder faced Aung La Nsang for the ONE Middleweight World Championship at ONE: Inside the Matrix on October 30, 2020. He won the bout by submission in the first round, becoming the champion.
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Reinier de Ridder
Reinier de Ridder (born September 7, 1990), also known by his initials RdR, is a Dutch professional mixed martial artist. He currently competes in the Middleweight division of the Ultimate Fighting Championship (UFC). He previously competed in ONE Championship, where he is a former ONE Middleweight World Champion and ONE Light Heavyweight World Champion. De Ridder was the third two-division champion in ONE history, having previously held the middleweight and light heavyweight belts simultaneously. As of October 21, 2025, he is #8 in the UFC middleweight rankings.
Reinier de Ridder started with Judo at the age of six and earned a black belt in his teens. After high school he began training in Brazilian Jiu-Jitsu while attending college and became a black belt. He also owns a physical therapy clinic in Breda, combining his working hours with his training hours.
De Ridder won a silver medal at the European Jiu-Jitsu Championship in 2016.
De Ridder returned to submission grappling competition at ONE X on March 26, 2022 against André Galvão. The match went the distance and as the promotion did not use judges for their submission grappling matches at the time, it was declared a draw.
De Ridder faced Tye Ruotolo in a submission grappling superfight at ONE Fight Night 10 on May 5, 2023. He lost the match by a close decision.
De Ridder had his first amateur fight in 2013, winning by first round submission, before making his professional MMA debut later that year, winning with a first round triangle choke. Reinier went on a seven fight winning streak with all the fights ending with stoppages. After this winning streak, Reinier got the opportunity to fight for his the Middleweight belt in HIT FC, which he won by first round rear-naked choke. After winning his next bout in under two minutes, Reinier got offers from the UFC and ONE FC, deciding to go with the latter due to better terms.
De Ridder made his ONE debut at ONE: Hero's Ascent on January 25, 2019 against Fan Rong, in a fight which he won by a first round submission. He would then face Gilberto Galvao at ONE: Legendary Quest, knocking out Galvao in the second round with knees, and former title contender Leandro Ataides at ONE: Warrior's Code, in which he won a hard fought decision.
De Ridder faced Aung La Nsang for the ONE Middleweight World Championship at ONE: Inside the Matrix on October 30, 2020. He won the bout by submission in the first round, becoming the champion.
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