CineCalidad. UFC on ABC 4: Rozenstruik vs. Almeida was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on May 13, 2023, at the Spectrum Center in Charlotte, North Carolina. A light heavyweight bout between former UFC Light Heavyweight Championship challenger Anthony Smith and Johnny Walker was originally expected to headline the event. However, the UFC decided to promote an already scheduled three-round heavyweight bout between Jairzinho Rozenstruik and Jailton Almeida to the five-round main event spot and downgrade the previous headliner to a three-round co-main event.