According to Ultimate Fighting Championship boss Dana White, retired former five division world champion Floyd Mayweather is lying about his claim of offering UFC superstar Conor McGregor a guaranteed purse of $15 million to fight in a boxing match. Mayweather, who retired in 2015 with a perfect 49-0 record, told ESPN’s First Take in a recent interview that a McGregor bout was the only thing that could tempt him to end his exile from the ring – but he would require at least $100 million as a guarantee.