Phusak Kerdrum (Thai: ???; born February 23, 1967), known professionally as Rajasak Sor.Vorapin (Thai: ราชศักดิ์ ส.วรพิน) is a Thai retired Muay Thai fighter. He is a three-division Rajadamnern Stadium champion who was famous during the 1980s and 1990s.

Rajasak started fighting in Muay Thai at the age of 14. He was trained by his father at his home in the Buriram province and was competing in the neighbouring provinces of Surin, Ubon Ratchathani and Korat. In 1987 he moved to Bangkok to join the Sor.Vorapin Gym.^[1]

In 1989 he defeated Ekaphon Chuwattana to capture the Rajadamnern stadium 115 lbs title. Later the same year he was matched with Langsuan Panyuthaphum in a fight billed as a champion against champion matchup. He was defeated by decision but won the rematch less than a month later.^[2]

Rajasak became a successful fighter of the Bangkok circuit with his heavy knee style, he mostly fought for the promotor Klaew Thanikhul. During his career he won the Rajadamnern Stadium belt at three different weights and defeated notable fighters of his era such as Langsuan Panyuthaphum, Jaroenthong Kiatbanchong, Therdkiat Sitthepitak, Robert Kaennorasing or Chamuekpet Hapalang.^[3]

After his fighting career Rajsak became a trainer, first at his old camp the Sor Vorapin and later in various camps, among them the Emerald Gym, Petchprasit Gym, Jitti gym, Phetsithong and 7MuayThai Gym.

• Rajadamnern Stadium
  • Rajadamnern Stadium Fighter of the Year
  • 1989 Rajadamnern Super Flyweight (115 lbs) Champion
  • 1990 Rajadamnern Super Bantamweight (122 lbs) Champion (1 defense)
  • 1991 Rajadamnern Featherweight (126 lbs) Champion

Muay Thai record

Date	Result	Opponent	Event	Location	Method	Round	Time
2000-09-22	Draw	Lakhin Sakjawee	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1999-	Win	Ahmed Lain		France	KO	1
1999-	Loss	Karim Saada		France	Decision	5	3:00
1995-09-04	Loss	Panmongkol Carriboy	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1995-07-05	Loss	Prabpramlek Sitsantad	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1995-05-22	Loss	Panmongkol Carriboy	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1995-02-01	Loss	Nuathoranee Wor.Taweekiat	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1994-12-	Win	Taweechai Wor Preecha	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1994-10-12	Win	Jongrak Khaadisorn	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1994-03-	Win	Samingnoi Sor Thanikul	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1994-02-10	Loss	Phannarin Sor.Suwanpakdee	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1994-01-13	Win	Phannarin Sor.Suwanpakdee	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1993-11-10	Win	Neungsiam Kiatwichian	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1993-10-06	Win	Banluedet Lukprabat	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1993-03-25	Win	Palangphet	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1992-11-11		Jack Kiatniwat	Rajadamnern Stadium	Bangkok, Thailand
1992-10-05	Win	Padphon Dejritta	Lumpinee Stadium	Bangkok, Thailand	Decision	5	3:00
1992-07-01	Loss	Suwitlek Lukbangplasoi	Lumpinee Stadium	Bangkok, Thailand	Decision	5	3:00
1992-06-19	Loss	Kangwannoi Or Seebualoi	Lumpinee Stadium	Bangkok, Thailand	Decision	5	3:00
1992-03-25	Loss	Robert Kaennorasing	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
For the Rajadamnern Featherweight (126 lbs) title.
1992-02-19	Loss	Noppadet Sor.Rewadee	Lumpinee Stadium	Bangkok, Thailand	Decision	5	3:00
1992-01-22	Loss	Kompetch Lukprabat	Lumpinee Stadium	Bangkok, Thailand	Decision	5	3:00
1991-12-18	Win	Neungsiam Kiatwichian	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1991-11-29	Loss	Neungsiam Kiatwichian	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1991-01-30	Win	Jack Kiatniwat	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1991-09-	Loss	Robert Kaennorasing	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1991-08-	Loss	Taweechai Wor.Preecha	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
Loses the Rajadamnern Featherweight (126 lbs) title.
1991-07-20	Win	Chamuekpet Hapalang	Crocodile Farm	Samut Prakan, Thailand	Decision	5	3:00
Wins the Rajadamnern Featherweight (126 lbs) title.
1991-06-19	Win	Robert Kaennorasing	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1991-05-26	Win	Jack Kiatniwat	MAJKF	Tokyo, Japan	TKO (Doctor Stoppage)	1	2:26
1991-05-	Loss	Padphon Dejritta	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1991-04-07	Win	Padejsuk Kiatsamran		Samut Sakhon, Thailand	Decision	5	3:00
1991-02-15	Loss	Therdkiat Sitthepitak		Phra Nakhon Si Ayutthaya, Thailand	Decision	5	3:00
1991-01-30	Loss	Jaroenthong Kiatbanchong	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1990-12-20	Win	Therdkiat Sitthepitak	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1990-11-29	Win	Neungsiam Kiatwichian	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
Defends the Rajadamnern Super Bantamweight (122 lbs) title.
1990-11-05	Win	Taweechai Wor.Preecha	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1990-09-25	Loss	Jaroenthong Kiatbanchong	Lumpinee Stadium	Bangkok, Thailand	Decision	5	3:00
1990-08-15	Win	Jaroenthong Kiatbanchong	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1990-07-09	Win	Padejsuk Kiatsamran	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
Wins the vacant Rajadamnern Super Bantamweight (122 lbs) title.
1990-06-14	Win	Chanalert Muanghatyai		Bangkok, Thailand	Decision	5	3:00
1990-05-10	Loss	Chanalert Muanghatyai	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1990-04-25	Loss	Chanalert Muanghatyai	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
For the vacant Rajadamnern Super Bantamweight (122 lbs) title.
1990-02-22	Win	Padejsuk Kiatsamran	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1990-01-04	Win	Mahaheng Tor.Boonlert	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1989-11-27	Win	Langsuan Panyuthaphum	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1989-11-02	Loss	Langsuan Panyuthaphum	Rajadamnern Stadium, Lumpinee vs Rajadamnern champion	Bangkok, Thailand	Decision	5	3:00
1989-09-25	Win	Dennuea Denmolee	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1989-07-13	Win	Ekaphon Chuwattana	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
Wins the vacant Rajadamnern Super Flyweight (115 lbs) title.
1989-06-15	Draw	Ekaphon Chuwattana	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
For the vacant Rajadamnern Super Flyweight (115 lbs) title.
1989-04-27	Win	Saenphet Chor.Waikul	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1989-04-10	Win	Samernoi Tor.Boonlert	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1989-03-23	Win	Lom-Isannoi Sor.Thanikul	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1989-01-25	Loss	Samernoi Tor.Boonlert	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1988-12-22	Loss	Waifai Prapatmotor	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1988-10-19	Win	Toiting Kiatphetnoi	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1988-	Draw	Yodkunthap Sikrupat	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1988-	Win	Senrak Lukprabat	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1988-	Win	Nampetch Moisayon	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1988-	Win	Den Yuthakit	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1988-	Win	Kukai Kaisingprum	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1988-	Win	Sameulek Sor Pariya	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1987-	Loss	Chokchai Majestic	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1987-	Win	Saphaynoi Por Chaiwan	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1987-	Win	Noppadet Lukprabat	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1987-	Win	Boonsom Bualuang-Prakanpay	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1987-	Win	Sorakom Kiatisrirang	Rajadamnern Stadium	Bangkok, Thailand	Decision	5	3:00
1987-	Win	Yodmangson Sitmuangthong	Rajadamnern Stadium	Bangkok, Thailand	KO
Legend:   Win   Loss   Draw/No contest   Notes