What happened: Nadaka Yoshinari puts the ONE Atomweight Muay Thai World Title on the line against challenger Rifdean Masdor at ONE Samurai 4 in Tokyo. The championship bout follows Nadaka's kickboxing debut against Har Ling Om at ONE Samurai 3 in September.

Why it matters: Nadaka returns to Muay Thai title action carrying a seven-year unbeaten streak that Masdor aims to snap in Tokyo. The atomweight title clash anchors a ONE Samurai 4 card that also features Masaaki Noiri facing Mohammad Siasarani and Takeru's Hall of Fame induction.

What to watch: Nadaka and Masdor meet this Saturday in Tokyo at ONE Samurai 4 with the atomweight Muay Thai belt at stake.