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ONE Fight Night 27: Tang vs. Abdullaev was a combat sports event produced by ONE Championship that took place on January 11, 2025, at Lumpinee Boxing Stadium in Bangkok, Thailand. A ONE Featherweight World Championship bout between current champion Tang Kai and Akbar Abdullaev headlined the event. At the weigh-ins, Abdullaev failed two hydration tests and changed to five-round non-title bout in a 156.75 pounds instead.