Kosei Tanaka Boxing Rankings History | Box-Rank

Ranking history summary

Summary from monthly sanctioning-body lists in our database (not a fight record).

Ranking time span

March 2014 – May 2025

Time ranked

11 years 2 months

Time as world champion

3 years 8 months

World titles held

Super Flyweight

WBO Champion24 February 2024 – September 2024

Flyweight

WBO Champion24 September 2018 – 31 January 2020

Light Flyweight

WBO Champion31 December 2016 – 30 November 2017

Minimumweight

WBO Champion30 May 2015 – 7 April 2016

By division

Division	First entered rankings	Most recently in rankings	Time ranked
Super Flyweight	February 2020	May 2025	5 years 1 month
Flyweight	December 2017	December 2020	3 years
Light Flyweight	April 2016	November 2017	1 year 8 months
Minimumweight	March 2014	April 2016	2 years 2 months

Time ranked counts distinct months this fighter appears on a rankings list for that division. If they drop out and return later, months off the ranking lists are not included.