![ONE Fight Night 21 ONE Fight Night 21](/modules/owlapps_apps/img/nopic.jpg)
ONE Fight Night 21: Eersel vs. Nicolas was a combat sport event produced by ONE Championship that took place on April 6, 2024, at Lumpinee Boxing Stadium in Bangkok, Thailand.
A ONE Lightweight Kickboxing World Championship bout between current champion (also current ONE Lightweight Muay Thai World Champion) Regian Eersel and Alexis Nicolas headlined the event.
A ONE Welterweight Submission Grappling World Championship bout between current champion Tye Ruotolo and Izaak Michell took place at the co-main event. The bout was originally scheduled at ONE 166 on March 1, but the bout moved at this event for unknown reason.
The following fighters received $50,000 bonuses.
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