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.

UFC on ESPN 45: Song vs. Simon

UFC on ESPN 56: Lewis vs. Nascimento was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on May 11, 2024, at the Enterprise Centre, in St. Louis, Missouri, United States. A heavyweight bout between former UFC Heavyweight Championship challenger Derrick Lewis and Rodrigo Nascimento headlined the event.