Mini Flyweight World/Lineal Champions (105lbs)

Napa Kiatwanchai (10/6/1989 – 12/11/1989)

Kiatwanchai (1) beat Hiroki Ioka (2) BNews

Jum-Hwan Choi (12/11/1989 – 7/2/1990)

Hideyuki Ohashi (7/2/1990 – 25/10/1990)

Ricardo Lopez (25/10/1990 – 1/9/1999)

Lopez moved up in weight
Yutaka Niida (3/7/2004 – 15/9/2008)

Niida (5) beat Noel Arambulet (1)
Roman Gonzalez (15/9/2008 – 8/10/2010)
Gonzalez moved up in weight
Kazuto Ioka (20/6/2012 – 3/10/2012)

Ioka unified the WBA/WBC titles when beating Akira Yaegashi
Ioka moved up in weight
Francisco Rodriguez Jnr (9/8/2014 – 25/11/2014)

Rodriguez unified the IBF/WBO titles when beating Katsunari Takayama
Rodriguez moved up in weight
Katsunari Takayama (31/12/2014 – 31/12/2015)

Takayama unified the IBF/WBO titles when defeating Go Odaira
Jose Argumedo (31/12/2015 – 23/7/2017)
Hiroto Kyoguchi (23/7/2017 – 23/7/2018)

Kyoguchi moved up in weight

Knockout CP Freshmart (29/11/2018 –

​Freshmart (2) beat Byron Rojas (3). The Ring’s number one, Wanheng Menayothin, had not met a top five opponent for over two years