UFC on ESPN 45: Song vs. Simon was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on April 29, 2023, at the UFC Apex facility in Enterprise, Nevada, part of the Las Vegas Metropolitan Area, United States.

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Main Cast: Song Yadong, Ricky Simon, Caio Borralho, Michał Oleksiejczuk, Rodolfo Vieira, Cody Brundage, Fernando Padilla, Julian Erosa, Marcos Rogério de Lima, Waldo Cortes-Acosta

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