[7] Wanheng's promoter, Virat Vachirarattanawong, paid $175,000 to host the fight, a rarely high purse for the weight class.

[9] On 2 May 2018, Wanheng equalled Floyd Mayweather Jr.'s 50–0 record by knocking out Panamanian opponent Leroy Estrada in the fifth round in a mandatory title defense.

Menayothin was leading on all three scorecards at the time, 79-73, 78-74 and 78-74, and was awarded the technical decision victory and retained his WBC mini-flyweight belt.

[12] On 27 November 2020, he faced the WBC's number three ranked contender, Panya Pradabsri, at the City Hall Ground in Nakhon Sawan, Thailand.

After a closely contested fight Menayothin suffered the first defeat of his career, losing his WBC title via twelve-round unanimous decision.