Wanheng Menayothin

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. Mayweather's record is the highest number of wins recorded in pro boxing with no draws or losses.

On 29 August 2018, Wanheng eclipsed Mayweather, reaching 51–0 with a points win over Pedro Taduran.

On 6 November 2014, Wanheng won his first world title when he defeated defending champion Oswaldo Novoa to win the WBC minimumweight title. Novoa was badly hurt by an overhand punch in the ninth round and he retired in the corner. Wanheng's promoter, Virat Vachirarattanawong, paid $175,000 dollars to host the fight, a rarely high purse for the weight class. In his sixth defense, Wanheng beat Melvin Jerusalem via unanimous decision (115–113, 114–113, 114–113). Two scorecards were swung by a point deduction Jerusalem received after he threw a clear low blow.

Wanheng made his professional debut in January 2007. He won the WBC Youth world minimumweight title in his third fight. He later claimed two more secondary titles, with the WBC International Silver title and the WBC International title. In June 2011, Wanheng outpointed former world champion Florante Condes. On 31 May 2013, Moonsri defeated Raul Pusta Jr. by ninth-round technical knockout to retain the WBC International minimumweight title.

Chayaphon Moonsri (Thai: ชยพล มูลศรี ; formerly: Saengsuree Moonsri; แสงสุรีย์ มูลศรี; born 27 October 1985), known as Wanheng Menayothin (วันเฮง มีนะโยธิน) or Wanheng Kaiyanghadaogym is a Thai professional boxer who has held the WBC minimumweight title since 2014. As of February 2020, he is ranked as the world's best active minimumweight by BoxRec, The Ring and the Transnational Boxing Rankings Board.