Nicknamed the "Stone Man", he was especially known for his aggression and punching ability.
He fought under the name "Ruengsak Luklamplaimat" and dominated in Buriram and the neighboring provinces until he was brought to the Porntawee camp.
In 1974 Ruengsak became the 112 lbs champion of both Rajadamnern and Lumpinee stadiums, he earned the nickname "The Stone Man" for his incredible durability and the power of his strikes.
During his career Ruengsak defeated notable stadium champions such as Nongkhai Sor.Prapatsorn, Sirimongkol Luksiripat, Narongnoi Kiatbandit, or Padejsuk Pitsanurachan.
[1] In 1980 Ruengsak quit boxing for a few months before being convinced by Virat Vachirarattanawong to comeback after he bought him as debt clearance from the Porntawee gym owner.