This market will resolve to "Arnold Allen" if Arnold Allen is officially declared the winner of the fight against Melquizael Costa at UFC Fight Night: Allen vs. Costa, scheduled for May 16, 2026. It will resolve to "Melquizael Costa" if Melquizael Costa is officially declared the winner. If the fight is declared a draw or technical draw, ruled a No Contest, not scored, canceled, or postponed beyond May 30, 2026, this market will resolve "50-50." The resolution source for this market will be official information from the UFC.