Dejdamrong Sor Amnuaysirichoke (; 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.
Aside from competing in mixed martial arts, Dejdamrong was an instructor at the Evolve MMA gym based in Singapore until 2023. He currently owns and coaches at Sor Dejdamrong Muaythai in Phuket, Thailand.
Amnuaysirichoke competed in Muay Thai for over 20 years, and was a three-division Lumpinee Stadium champion at mini flyweight, light flyweight, and flyweight; and amassed an unofficial record of 282-65-3. He retired in 2007.
Amnuaysirichoke began his professional MMA career in 2014 for ONE Fighting Championship. On June 14, 2014, Dejdamrong made his debut at , where he defeated Jomanz Omanz by first-round TKO.
He started out undefeated at 6âÂÂ0, 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. Dejdamrong was the ONE World Champion for over a year before losing the title to Yoshitaka Naito on May 27, 2016. Since losing the Strawweight World Title, Dejdamrong has gone 5âÂÂ4 in ONE Championship.
On March 11, 2017, he lost to future ONE Strawweight World Champion Joshua Pacio by split decision at .
On May 26, 2017, Dejdamrong defeated Adrian Mattheis by first-round KO at .
On August 18, 2017, he stopped Robin Catalan by TKO in the second round at .
On December 9, 2017, Dejdamrong lost to Riku Shibuya by second-round submission via guillotine choke at .
Dejdamrong then lost to Jeremy Miado by first-round KO on March 24, 2018, at .
He would bounce back with a second-round submission victory over Himanshu Kaushik via rear-naked choke on November 9, 2018, at .
Dejdamrong faced Jeremy Miado in a rematch on February 22, 2019, at . This time, he was able to secure a second-round TKO victory.
He then faced Miao Li Tao on May 17, 2019, at , where he lost by first-round knockout.
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 .
Dejdamrong competed only once in 2020. On October 10, 2020, he faced Hexi Getu at . After getting dominated on the ground over three rounds, he lost by split decision.
Dejdamrong is scheduled to face Banma Duoji at on August 27, 2021. He won by technical knockout in the second round.
Dejdamrong faced Danial Williams at on February 11, 2022. He lost after a liver punch stopped the bout in the second round.
Following his fight with Williams, Dejdamrong announced his retirement on Instagram.
|- |Loss |align=center|12âÂÂ7 | Danial Williams | KO (punch to the body) | | |align=center| 2 |align=center| 1:35 | Kallang, Singapore | |- | Win | align=center|12âÂÂ6 |Banma Duoji |TKO (knees and punches) | | | align=center| 2 | align=center| 3:31 | Kallang, Singapore | |- | Loss | align=center|11âÂÂ6 |Hexi Getu |Decision (split) | | | align=center| 3 | align=center| 5:00 | Kallang, Singapore | |- | Win | align=center|11âÂÂ5 |Muhammad Imran |TKO (punches) | | | align=center| 3 | align=center| 1:21 | Kallang, Singapore | |- | Loss | align=center|10âÂÂ5 |Miao Li Tao |KO (punch) | | | align=center| 1 | align=center| 4:09 | Kallang, Singapore | |- | Win | align=center|10âÂÂ4 |Jeremy Miado |TKO (punches) | | | align=center| 2 | align=center| 2:38 | Kallang, Singapore | |- | Win | align=center|9âÂÂ4 |Himanshu Kaushik |Submission (rear-naked choke) | | | align=center| 2 | align=center| 4:45 | Kallang, Singapore | |- | Loss | align=center|8âÂÂ4 |Jeremy Miado |KO (punch) | | | align=center| 1 | align=center| 1:21 | Bangkok, Thailand | |- | Loss | align=center|8âÂÂ3 |Riku Shibuya |Submission (guillotine choke) | | | align=center| 1 | align=center| 2:36 | Bangkok, Thailand | |- | Win | align=center|8âÂÂ2 |Robin Catalan |TKO (knees and elbow) | | | align=center| 2 | align=center| 0:46 | Kuala Lumpur, Malaysia | |- | Win | align=center|7âÂÂ2 |Adrian Mattheis |KO (punches) | | | align=center| 1 | align=center| 4:26 | Kallang, Singapore | |- | Loss | align=center|6âÂÂ2 | Joshua Pacio | Decision (split) | | | align=center| 3 | align=center| 5:00 | Bangkok, Thailand | |- | Loss | align=center|6âÂÂ1 | Yoshitaka Naito | Submission (rear-naked choke) | | | align=center| 4 | align=center| 4:00 | Bangkok, Thailand | |- | Win | align=center|6âÂÂ0 | Yago Bryan | Decision (unanimous) | | | align=center| 5 | align=center| 5:00 | Kallang, Singapore | |- | Win | align=center|5âÂÂ0 | Roy Doliguez | Technical Decision (unanimous) | | | align=center| 5 | align=center| 3:29 | Kallang, Singapore | |- | Win | align=center|4âÂÂ0 | Rene Catalan | KO (knee) | | | align=center| 1 | align=center| 2:30 | Manila, Philippines | |- | Win | align=center|3âÂÂ0 | Saiful Merican | Submission (armbar) | | | align=center| 2 | align=center| 2:12 | Kuala Lumpur, Malaysia | |- | Win | align=center|2âÂÂ0 | Ali Yaakub | Submission (rear-naked choke) | | | align=center| 1 | align=center| 2:34 | Dubai, United Arab Emirates | |- | Win | align=center| 1âÂÂ0 | Jomanz Omanz | TKO (knees) | | | align=center| 1 | align=center| 4:33 | Jakarta, Indonesia | |-
|- style="background:#cfc;" | 2010-07-11|| Win||align=left| Oji || Muay Thai Open 12 || Tokyo, Japan || Decision (Unanimous) || 3 ||3:00 |- style="background:#cfc;" | 2009-11-28|| Win||align=left| Kojiro || NJKF ROAD TO REAL KING 14 || Tokyo, Japan || TKO || 2 ||2:44 |- style="background:#cfc;" | 2008-10-05|| Win||align=left| Yuzo Maki || Muay Thai Open 5 || Tokyo, Japan || KO (Right Hook) || 3 ||0:39 |- style="background:#cfc;" | 2008-07-27|| Win||align=left| Hiroki Maeda || NJKF START OF NEW LEGEND IX || Tokyo, Japan || KO (Right High Kick) || 2 ||2:37 |- style="background:#cfc;" | 2007-07-29|| Win||align=left| Kunitaka || NJKF Fighting Evolution IX Muay Thai Open || Tokyo, Japan || Decision (Unanimous) || 5 ||3:00 |- style="background:#cfc;" | 2006-01-14 || Win||align=left| || Omnoi Stadium || Samut Sakhon || Decision || 5 || 3:00 |- ! colspan="8" style="background:white" | |- style="background:#fbb;" | 2005-07-12|| Loss||align=left| Denchiangkwan Laemthong|| Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="background:#cfc;" | 2005-04-12|| Win||align=left| Denchiangkwan Laemthong|| Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="background:#cfc;" | 2004-12-16|| Win||align=left| Kulabdaeng Por Pinyo|| Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="background:#fbb;" | 2004-10-01|| Loss||align=left| Runganan Sor.Jor.Suwit|| Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="background:#fbb;" | 2004-08-07|| Loss||align=left| Yoksila Kiatprasarnchai|| Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="background:#cfc;" | 2004-06-22|| Win||align=left| Newpetch Buamuang Rueangkit|| Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="background:#fbb;" | 2004-03-12 || Loss||align=left| Jomyut Phitakruchaiden || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="background:#fbb;" | 2004-01-23 || Loss||align=left| Hanchai Kiatyongyuth || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2003-12-09 || Loss||align=left| Suwitlek Sit-Ubon || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- ! colspan="8" style="background:white" | |- style="background:#fbb;" | 2003-08-16 || Loss||align=left| Saensuk Por Kaewsen|| || Yala province, Thailand || Decision || 5 || 3:00 |- style="background:#fbb;" | 2002-06-11 || Loss||align=left| Panomroonglek Kiatmuu9|| Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="background:#fbb;" | 2002-05-18 || Loss||align=left| Panomroonglek Kiatmuu9|| Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="background:#c5d2ea;" | 2002-01-05 || Draw||align=left| Rittidet Maimankon || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="background:#fbb;" | 2001-08-21 || Loss||align=left| Yodsanklai Fairtex || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="background:#cfc;" | 2001-04-06 || Win||align=left| Chawalit Sit.Or || Lumpinee Stadium || Bangkok, Thailand || KO|| 1 || |- style="background:#cfc;" | 2000-08-13 || Win||align=left| Namkabuanlek Nongkeepahuyuth || || Thailand || Decision || 5 || 3:00 |- style="background:#fbb;" | 1999-06-26 || Loss||align=left| Chatchainoi Sitbenjama || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- style="background:#cfc;" | 1999-05-02 || Win||align=left| Thailandlek Kiatratchawat|| || Bangkok, Thailand || Decision || 5 || 3:00 |- style="background:#cfc;" | 1998-11-16 || Win||align=left| Khunkrai Srisinthorn || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- | colspan=9 | Legend: