Veteran boxing superstar Floyd Mayweather will fight 20-year-old Japanese kickboxer Tenshin Nasukawa in a Rizin Fighting Federation bout on New Year's Eve, the mixed martial arts organization announced Monday.The fight between the once retired 41-year-old Mayweather, who held world titles in five different weight classes and has a 50-0 pro boxing record, and undefeated Nasukawa will take place at the Saitama Super Arena on Dec. 31."I think that he's young, very strong, very fast, and he's undefeated so it's obvious he's been doing something right to be where he's at," Mayweather said at a p…READ FULL ARTICLE