Somboon Pantasi was born on July 11, 1972 in Changhan district, Roi Et province located in the Isaan region.

Since becoming a Muay Thai fighter was the only option he had to escape poverty,[3] he started training at home and began his fighting career at the age of 12 under the ring name of Ayjoy Sitsiansai.

After achieving a winning streak starting with his first fight, he joined the Sitkru-Am gym and began training under Pratan "Kru Am" Chantaret.

After winning numerous fights in Isaan with Kru Am's coaching, he later transferred to and began living in the popular Lukjaopormehasak gym which was owned by Prisak "Pele" Inthapan.

There, Pantasi would become a teammate of "The Elbow Hunter of 100 Stitches" Yodkhunpon Sittraiphum and changed his ring name to Saenmuangnoi Lukjaopormehasak.

[4][5][2]: 3:27–4:56 In the Lukjaopormehasak gym, Pantasi became more adept with pressure fighting and punching under the tutelage of Apisit Petsanghan, a gold medalist in the 1998 Thailand National Games.

Rattanasuban wanted him to take Muay Thai fights in Bangkok, but it was believed that Pantasi's short stature, dark skin, and facial features would prevent him from becoming popular in the capital city.

[7]: 59:00–59:15  Notably, he fought in an orthodox stance at 17-years-old for the 100 lbs (45.36 kg) Thailand title in 1989 against Rittidej Sor.Ploenchit in Samrong stadium.

[7][10] After beating other elite fighters in 1990 including Takrawlek Dejrath, Kiewmorakot Praianan, and Denthaksin Sor.Suwanpakdee, 1991 was the most significant period of Samson's career.

However, Samson later knocked out Veerapol with punches, winning the Super Flyweight Muay Thai World title.

[6]: 56:25–1:05:46  In his next fight, Samson would win the Lumpinee Bantamweight title against Saenklai Sit Kru Od by way of knockout.

In between his 2 losses to Jaroensak Kiatnakornchon, Samson was able to beat knockout artist Lakhin Wassandasit, a Muay Maat fighter who had just won the Isuzu-sponsored tournament and was at his top form at the time.

Taweesaklek Ploysakda, a Muay Bouk fighter referred to as "The Sadist" by the Thai media had his final fight against Samson.

[12] The third match between them had the Rajadamnern Super Flyweight title at stake; Samson won the fight and earned the championship.

[17] In his 3rd professional boxing fight, Samson beat his first top opponent, Philippine champion Dan Nietes, by decision.

He had his first title defense against Indonesian challenger Ippo Gala in 1994 in Chiang Rai on the undercard of Johnny Nelson vs. Nikolay Kulpin.

He usually faced weaker boxers but also was able to fight and beat top opponents whenever possible, such as Cruz Carbajal, Hugo Rafael Soto, and Diosdado Gabi.

[19][22][23] In late 2004, on the 48th anniversary of the Lumpinee Stadium, Samson participated in a Muay Thai fight against his role model "Rambo" Pongsiri Por.Ruamrudee.

Under the ring name of Samson Petchyindee, he won the bout with 20:1 betting odds in his favor by the end of the fight.