Songchai Rattanasuban
Thai businessperson

Songchai Rattanasuban (Thai: ทรงชัย รัตนสุบรรณ; born: March 5, 1946 in Chachoengsao province) is a famous Thai Muay Thai and professional boxing promoter. He is well known for being a promoter of the fight dubbed "Suek Onesongchai" (ศึกวันทรงชัย; lit: "Songchai Day Battle") of Lumpinee Stadium especially in the 1980s and 1990s that have been recognized as the golden era of Muay Thai. He is the founder and CEO of Onesongchai Promotion, a Muay Thai and professional boxing promotion company based in Bangkok.
Biography
He was born in Thai Chinese family at the Amphoe Mueang Chachoengsao, Chachoengsao province by the Bang Pakong River. He likes Muay Thai since childhood. He used to Mauy Thai along with his brother. He also competed at the Lumpinee Stadium in Bangkok but it appears that his record 22 times lose more than win.
Songchai started as a promoter in 1965, when he was only 18 years old, starting at his native. Which he held every month for 4 years until his reputation became known. In 1974, he became an assistant promoter at the Lumpinee Stadium until 1975, so he was appointed as a regular promoter.
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