Namsaknoi spent his formative years in Kiatsingnoi Gym in Bangkok, alongside other golden-era champions such as Pairot, Wangchannoi, and Rattanachai.
He climbed his way up steadily in the competitive fight scene of the country's capital, often matched against older and more experienced fighters and winning most of them.
[6] Throughout his fight career, he fought some of the best Thai fighters of the golden era, including Neungpichit Sidyodtong, Saenchai PKSaenchaimuaythaigym, Samkor Kiatmontep, Attachai Fairtex, Kaolan Kaovichit, and Lamnammoon Sor Sumalee.
He only fought a handful of fights outside of Thailand, in Japan (where he won a 2nd round TKO against the dangerous Satoshi Kobayashi),[7] Korea, Macau, and Italy.
Namsaknoi held the 135 lbs Lumpinee Stadium Belt for an astounding 6 years, until his retirement in 2006, ending his career with an impressive record of 280 wins, 15 losses, and 5 draws.
[12] Destitute with no money nor belts to his name (he left most of his physical possessions in the camp when he walked out),[11] Namsaknoi returned to his hometown of Chaiya in Surat Thani province, never to step into the rings of Bangkok again.
In 2010, he was approached by Chatri Sityodtong to join Evolve Mixed Martial Arts in Singapore, where he worked as a Muay Thai instructor for 6 years.