Sitthichai Somphoom (born August 25, 2004), known professionally as Petchsiam Jor.Pattreya (Thai: เพชรสยาม จ.ภัทรีย, is a Thai Muay Thai fighter.^[1][2][3][4] He is a former Rajadamnern Stadium Light Flyweight Champion and Rajadamnern Stadium Super Bantamweight Champion.

As of October 2024, he is ranked #5 in the WMO's Super Bantamweight rankings.^[5][6][7]

Petchsiam won his first major title on February 7, 2022, when he defeated Petchmawin Singmawynn by decision to capture the Rajadamnern Stadium light flyweight title. He later vacated the title in order to move up in weight.^[8]

On September 24, 2023, Petchsiam defeated Detchpet Muayded789 by decision at the Channel 7 Stadium.^[9]

In December 2023 Petchsiam was announced as part of a shortlist of 3 fighters nominated for the 2023 Sports Authority of Thailand Fighter of the Year award.^[10]

As of March 2024 he was ranked as one of the 10 best pound-for-pound muay thai fighters in the world by the WMO.^[11]

Following his knockout loss against Khunsueklek Boomdeksian in May 2024, Petchsiam's Rajadamnern Stadium Super Bantamweight title was stripped from him. Petchsamarn Sor.Samarngarment and Parnthep V.K.Khaoyai's interim title fight planned for the month after was promoted to a fight for the regular Rajadamnern Stadium Super Bantamweight title.

• Rajadamnern Stadium
  • 2022 Rajadamnern Stadium Light Flyweight (108 lbs) Champion
  • 2024 Rajadamnern Stadium Super Bantamweight (122 lbs) Champion^[12]

Muay Thai Record^[13]

68 Wins, 18 Losses
Date	Result	Opponent	Event	Location	Method	Round	Time
2024-12-08	Win	Teeded ChangNakhonsi	Channel 7 Stadium	Bangkok, Thailand	Decision	5	3:00
2024-10-26	Loss	Den SitNayaktaweebtapong	Muay Thai Vithee TinThai + Kiatpetch, Chang International Circuit	Buriram province, Thailand	Decision	5	3:00
2024-08-12	Loss	Petchsangwan Sor.SamarnGarment	Channel 7 Stadium	Bangkok, Thailand	KO (Knees)	3
2024-07-04	Loss	Petchsila Wor.Auracha	Petchyindee + Kiatpetch, Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
2024-05-11	Loss	Khunsueklek Boomdeksian	Rajadamnern World Series	Bangkok, Thailand	KO (Left high kick)	3	0:32
For the Rajadamnern Stadium Bantamweight (118 lbs) title. Stripped of his 122 lbs title for losing by knockout.
2024-03-31	Win	Chalamdam Nayokathasala	Channel 7 Stadium	Bangkok, Thailand	Decision	5	3:00
2024-02-17	Win	Wuttikorn Suannamtankiri	Rajadamnern World Series, Rajadamnern Stadium	Bangkok, Thailand	TKO (Referee stoppage)	4
Wins the vacant Rajadamnern Stadium Super Bantamweight (122 lbs) title.
2023-12-13	Win	PetchNongNuey NokKhao-GorMor.11	Chang Muay Thai Kiatpetch Tesaban Muang Cha-am Sanjorn	Phetchaburi province, Thailand	Decision	5	3:00
2023-10-28	Win	Chalamdam Nayokathasala	Muay Thai Vithee TinThai + Kiatpetch	Buriram Province, Thailand	Decision	5	3:00
2023-09-24	Win	Detchpet Muayded789	Channel 7 Stadium	Bangkok, Thailand	Decision	5	3:00
2023-08-05	Win	Kongpop Wor.Suksan	Ruamponkon Samui, Phetchbuncha Stadium	Ko Samui, Thailand	Decision	5	3:00
2023-06-11	Win	Sudlor Aod Tuk Daeng	TorNamThai Kiatpetch TKO, Rajadamnern Stadium	Bangkok, Thailand	TKO	4
2023-05-14	Win	Wanwiset Sor.Dechapan	TorNamThai Kiatpetch TKO, Rajadamnern Stadium	Bangkok, Thailand	TKO (Elbows)	2	1:09
2023-04-16	Win	Maisangkham Sor.YingcharoenKarnchang	TorNamThai Kiatpetch TKO, Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
2023-02-26	Win	Wuttikorn Suannamtankiri	Kiatpetch, Channel 7 Stadium	Bangkok, Thailand	Decision	5	3:00
2023-02-11	Loss	Dionata Sor.Dechapan	Ruamponkon Samui, Phetchbuncha Stadium	Ko Samui, Thailand	Decision	5	3:00
2023-01-22	Win	Yokkiree Sor.Petchamrat	Kiatpetch, Channel 7 Stadium	Bangkok, Thailand	Decision	5	3:00
2023-01-01	Win	Tahaneak Nayokatasala	Kiatpetch, Channel 7 Stadium	Bangkok, Thailand	Decision	5	3:00
2022-11-19	Loss	Wuttikorn Suannamtankiri	Lumpini Muay Thai TKO, Lumpinee Stadium	Bangkok, Thailand	Decision	5	3:00
2022-10-16	Loss	Phayakjiew KeelaSport	Chang Muay Thai Kiatpetch, Rajadamnern Stadium	Bangkok, Thailand	KO (Knee to the body)	3
2022-09-19	Win	Lomchoi Sor.Therapat	Palangmai, Thupatemi Stadium	Pathum Thani, Thailand	KO	4
2022-08-21	Win	Samersing Lukchaoporluangwang	Chang Muay Thai Kiatpetch, Rajadamnern Stadium	Bangkok, Thailand	KO (Knee to the body)	4
2022-07-17	Loss	Phetnamchai Sor.Jor.TongPrachin	Chang Muay Thai Kiatpetch, Rajadamnern Stadium	Bangkok, Thailand	KO (Kick to the groin)	2
2022-06-19	Win	Domthong Lukjaoporongtom	Channel 7 Stadium	Bangkok, Thailand	Decision	5	3:00
2022-05-08	Win	Domthong Lukjaoporongtom	Kiatpetch, Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
2022-03-06	Loss	Phetmalai Petcharoenwit	Kiatpetch, Rajadamnern Stadium	Bangkok, Thailand	TKO (Referee stoppage)	4
2022-02-07	Win	Petchmawin Singmawynn	Rajadamnern World Series, Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
Wins the Rajadamnern Stadium Light Flyweight (108 lbs) title.
2021-12-20	Loss	Sudlor Aod TukDaeng	Singmawynn, Rajadamnern Stadium	Bangkok, Thailand	KO (Knee to the head)	3
2021-11-20	Loss	Phetsongsang Petchyindee Academy	Kiatpetch, Lumpinee Stadium	Bangkok, Thailand	Decision	5	3:00
2021-10-24	Win	Phetsongsang Petchyindee Academy	Phetkiatpetch, Phetchbuncha Samui Stadium	Ko Samui, Thailand	Decision	5	3:00
2021-10-09	Win	Nong-O Chor.Rueangram	Phetkiatpetch, Phetchbuncha Samui Stadium	Ko Samui, Thailand	Decision	5	3:00
2021-04-03	Win	Putti Nanumnee	Kiatpetch, Lumpinee Stadium	Bangkok, Thailand	Decision	5	3:00
2021-02-21	Win	Saiphet KongthaniMuayThai	Chang Muay Thai Kiatpetch, Or.Tor.Gor 3 Stadium	Nonthaburi, Thailand	Decision	5	3:00
2020-02-01	Loss	Khunsueklek Boomdeksian		Nakhon Ratchasima province, Thailand	Decision	5	3:00
2019-05-24	Loss	Khunsueklek Boomdeksian		Maha Sarakham province, Thailand	Decision	5	3:00
Legend:   Win   Loss   Draw/No contest   Notes

• Rajadamnern Stadium

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