Jirapart Waiprakorn (born October 20, 1996), known as Manachai, is a Muay Thai fighter and Former WMO Welterweight World Champion from Thailand.

During his early career he competed in the Isaan region and made his way to fighting at Lumpinee Stadium in Bangkok, during which he was ranked number one in his weight division at one point.

In February 2017, CNN Money featured YOKKAO in a television documentary special showcasing young, successful businesses in Thailand.

On 20 August 2017, Manachai appeared on the inaugural All-star Fight promotion alongside YOKKAO teammate, Pakorn and Muay Thai star, Buakaw.

[3] A month later, Manachai made his second Hong Kong appearance with YOKKAO 26 on 11 September winning a unanimous decision over his Spanish opponent, Carlos Araya.

On 20 January 2018, he made his Italian debut on The Night of Kick and Punch promotion facing local fighter, Nuriel Glorian Cauli.

[17] On 29 April 2018, UK fighter Mo Abdurahman concluded Manachai's winning streak at YOKKAO Next Generation Southampton with a round-3 KO via right hook.

[21][22][23] On 29 October 2018, Manachai took on Julio Lobo from Brazil for the WBC Muay Thai World Welterweight title at YOKKAO 34.

He won the fight via decision and was crowned the new WBC welterweight champion at the Kowloon Bay International Trade & Exhibition Centre.