UFC 189: Mendes vs. McGregor

The event stood as one of the biggest UFC shows of its era, both commercially and culturally. It was headlined by an interim Featherweight Championship fight between Conor McGregor and Chad Mendes, booked after José Aldo withdrew with an injury. It remains the only fight in UFC history where musicians sang the fighters to the cage, with Sinéad O’Connor and Aaron Lewis. The card also featured Robbie Lawler vs. Rory MacDonald, a Welterweight title fight widely regarded as one of the greatest ever.