[5] Sponsored by Thai convenience store chain CP Freshmart (a network of Charoen Pokphand),[6] he won the vacant WBC Youth World mini-flyweight title in his professional debut on June 22, 2012, defeating Marzon Cabilla by a sixth-round technical decision.
Knockout then defeated Carlos Buitrago by unanimous decision (115–113, 115–113, 115–113) to win the vacant WBA mini-flyweight interim title on October 1, 2014.
[10] Knockout was scheduled to make the first defense of his WBA strawweight title against the former OPBF champion Shin Ono on December 14, 2016.
[14] On April 17, 2017, the WBA ordered Knockout to face the mandatory title challenger Rey Loreto, giving the two parties 30 days to negotiate the terms of the bout.
Loreto appeared to edge the first four rounds, successfully controlling the range and causing his opponent's eye to begin swelling shut.
[18] Knockout made the fifth defense of his WBA title against the former WBC mini-flyweight champion Xiong Chaozhong on July 27, 2018.
The bout was contested in the Guosen Gymnasium in Qingdao, China, which was the first time that Knockout fought outside of Thailand in his professional boxing career.
[20] Knockout was scheduled to fight a rematch with the former WBA mini-flyweight titlist Byron Rojas in his sixth title defense, on November 29, 2018.
The fight was stopped due to a cut on Freshmart's left eyelid, which was caused by one of the numerous head clashes throughout the bout.
[26] Knockout was scheduled to make his ninth WBA title defense against fellow countryman Pongsaklek Sithdabnij on October 5, 2021, at the Chang Arena in Buriram, Thailand.
[31] Freshmart faced Oscar Collazo for the unified WBA, WBO and the inaugural symbolistic The Ring mini-flyweight titles on November 16, 2024 in Riyadh, Saudi Arabia.