Phetasawin started competing in Muay Thai at the age of 8 trained by his father.
He was at the Sor Likorn camp in his native province of Nakhon Si Thammarat as a child and later joined the Saengmorakot gym in Bangkok at the age of 12.
[2] On February 19, 2011, Phetasawin travelled to Glasgow, Scotland to face UK number 1 Liam Harrison at Super Showdown II.
[5] Phetasawin defeated Charles François by split decision at Best of Siam 3 in Paris, France, on February 14, 2013.
[9][10][11] On September 22, 2013, Phetasawin travelled to Prague where he defeated local Jan Moncol by decision.