UFC Fight Night 257: Walker vs. Zhang was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on August 23, 2025, at the Shanghai Indoor Stadium in Shanghai, China. A light heavyweight bout between Johnny Walker and Zhang Mingyang headlined this event.

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Main Cast: Johnny Walker, Zhang Mingyang, Aljamain Sterling, Brian Ortega, Sergey Pavlovich, Waldo Cortes-Acosta, Su Mudaerji, Kevin Borjas, Taiyilake Nueraji, Kiefer Crosbie

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