Naoya Inoue vs. Paul Butler, billed as Undisputed, was a bantamweight unification professional boxing match contested between WBA (Super), WBC, IBF, and The Ring champion, Naoya Inoue, and WBO champion, Paul Butler.

Inoue knocked out Butler and became the undisputed bantamweight champion and the first since Enrique Pinder beat Rafael Herrera in 1972.

Inoue prevailed via second-round technical knockout to unify three of the four major world titles in the bantamweight division and retain his undefeated record.

[4] John Riel Casimero had captured the WBO bantamweight title on 30 November 2019 with a third-round technical knockout victory over Zolani Tete,[5] and a unification clash between Inoue and Casimero had been scheduled for 25 April 2020; however, the fight was ultimately cancelled due to the COVID-19 pandemic.

[7] Butler, who had defeated Jonas Sultan via unanimous decision twelve days earlier to win the WBO interim title, was elevated to become the full WBO champion, making him a two-time bantamweight champion, having previously held the IBF title in 2014.