ONE Friday Fights 21: Paidang vs. Kongsuk (also known as ONE Lumpinee 21) was a combat sports event produced by ONE Championship that took place on June 16, 2023, at Lumpinee Boxing Stadium in Bangkok, Thailand. A flyweight muay thai bout between Paidang Kiatsongrit and Kongsuk Fairtex served as the event headliner.

ONE Friday Fights 35: Kongsuk vs. Dedduanglek was a combat sports event produced by ONE Championship that took place on September 29, 2023, at Lumpinee Boxing Stadium in Bangkok, Thailand. A flyweight muay thai bout between former two-division Lumpinee Stadium world champion Kongsuk Fairtex and Road to ONE Thailand winner Dedduanglek Tded99 served as the event headliner.