Prajanchai also won a WBA Asia South Featherweight title.

Prajanchai made his boxing debut on 29 August 2020, when he was scheduled to challenge the reigning WBA Asia South featherweight champion Arnon Yupang.

[1] In his second professional boxing bout, held on 31 October 2020, Prajanchai faced the former WBC Light Flyweight champion Kompayak Porpramook.

[2] He won the fight by unanimous decision, with all three judges awarding him all ten rounds of the bout.

He won the fight by unanimous decision, once again taking all ten rounds on all the judges' scorecards.