Dejdamrong Sor Amnuaysirichoke (Thai: เดชดำรงค์ ส.อำนวยศิริโชค; born November 7, 1978) is a Thai former mixed martial artist who has competed in ONE Championship, where he competed in the strawweight division. He is a former ONE Strawweight World Champion, being the inaugural titleholder, and is considered to be one of the most successful Thai mixed martial artists, having become the first Thai to win an MMA world title.
Prior to mixed martial arts, Dejdamrong was a Muay Thai fighter with 350 fights who won multiple Lumpinee Stadium titles in three different weight classes.[1]
Aside from competing in mixed martial arts, Dejdamrong is also an instructor at the Evolve MMA gym based in Singapore.
Amnuaysirichoke competed in Muay Thai for over 20 years, and was a three-division Lumpinee Stadium champion at mini flyweight, light flyweight, and flyweight;[2] and amassed an unofficial record of 282-65-3.[3] He retired in 2007.[4]
Amnuaysirichoke began his professional MMA career in 2014 for ONE Fighting Championship. On June 14, 2014, Dejdamrong made his debut at ONE FC: Era of Champions, where he defeated Jomanz Omanz by first-round TKO.
He started out undefeated at 6–0, including a win over Roy Doliguez on May 22, 2015, to claim the ONE Strawweight World Championship, becoming the most successful Thai mixed martial artist and first Thai world champion in MMA.[5] Dejdamrong was the ONE World Champion for over a year before losing the title to Yoshitaka Naito on May 27, 2016.[6] Since losing the Strawweight World Title, Dejdamrong has gone 5–4 in ONE Championship.
On March 11, 2017, he lost to future ONE Strawweight World Champion Joshua Pacio by split decision at ONE Championship: Warrior Kingdom.[7]
On May 26, 2017, Dejdamrong defeated Adrian Mattheis by first-round KO at ONE Championship: Dynasty of Heroes.[8]
On August 18, 2017, he stopped Robin Catalan by TKO in the second round at ONE Championship: Quest for Greatness.[9]
On December 9, 2017, Dejdamrong lost to Riku Shibuya by second-round submission via guillotine choke at ONE Championship: Warriors of the World.[10]
Dejdamrong then lost to Jeremy Miado by first-round KO on March 24, 2018, at ONE Championship: Iron Will.[11]
He would bounce back with a second-round submission victory over Himanshu Kaushik via rear-naked choke on November 9, 2018, at ONE Championship: Heart of the Lion.[12]
Dejdamrong faced Jeremy Miado in a rematch on February 22, 2019, at ONE Championship: Call to Greatness. This time, he was able to secure a second-round TKO victory.[13]
He then faced Miao Li Tao on May 17, 2019, at ONE Championship: Enter the Dragon, where he lost by first-round knockout.[14]
Nevertheless, Dejdamrong was able to close out 2019 on a high note with a third-round TKO victory over Muhammad Imran on November 22, 2019, at ONE Championship: Edge Of Greatness.[15]
Dejdamrong competed only once in 2020. On October 10, 2020, he faced Hexi Getu at ONE Championship: Reign of Dynasties. After getting dominated on the ground over three rounds, he lost by split decision.[16]
Dejdamrong is scheduled to face Banma Duoji at ONE Championship: Battleground 3 on August 27, 2021.[17] He won by technical knockout in the second round.[18]
Dejdamrong faced Danial Williams at ONE: Bad Blood on February 11, 2022. He lost after a liver punch stopped the bout in the second round.[19]
Following his fight with Williams, Dejdamrong announced his retirement on Instagram.[20]