Floyd Mayweather Jr. announced his plans to fight Japanese kickboxer Tenshin Nasukawa on Dec. 31 in Saitama, north of Tokyo. The 41-year-old Mayweather is 50-0 in his boxing career but has never fought professionally under MMA rules. He did, however, have a huge win in a boxing match against MMA fighter Conor McGregor last year. … Read more