[1] In 2015, after a long career which saw him win a Lumpinee title, Singtongnoi retired following an injury sustained in his last fight.
[3] In his comeback, Singtongnoi faced Joseph Lasiri at ONE Championship: Unstoppable Dreams in a ONE Super Series Muay Thai match.
[4] Next, he faced Masahide Kudo under ONE Super Series kickboxing rules at ONE Championship: Kingdom of Heroes in Bangkok on October 6, 2018.
[6] Then, at ONE Championship: Immortal Triumph on September 6, 2019, he lost to Kohei "Momotaro" Kodera by KO in just 41 seconds of the first round, marking the fastest knockout in ONE Super Series history.
[7] This record was later shattered by Capitan Petchyindee Academy, who knocked out Petchtanong Banchamek in just 6 seconds at ONE Championship: A New Breed 3 on September 18, 2020.