[1] Sor Vorasingh turned professional in 1975 at the age of fifteen, after being unsuccessful in Muay Thai style.
[1] For the third time in 1978, he succeeded when he won the WBC light flyweight title with a decision win over Venezuela's Freddy Castillo at Thai Army Sports Stadium, Bangkok.
On September 30, 1978, Sung-Jun Kim of South Korea knocked out the 4’10” southpaw Sor Vorasingh in three rounds, making him, at nineteen years and 5 months old, the youngest fighter to ever lose a world title.
[2] In 1981, Sor Vorasingh challenged the WBC light flyweight title holder Hilario Zapata from Panama at Suranari Military Camp, 2nd Army Area, Nakhon Ratchasima Province, but lost to a technical knockout in 10th round.
[1] Sor Vorasingh died on December 3, 1982, in a motorcycle accident in his hometown Phang Khon District, just 4 months after the fight with Payakaroon.