Former five-weight-class world champion Floyd Mayweather defeated Japanese mixed martial arts fighter Tenshin Nasukawa in an exhibition boxing match in Tokyo on New Year's Eve.Mayweather sent Nasukawa to the floor three times during Monday night's first round, beating the 20-year-old Japanese kickboxer by technical knockout in 2 minutes, 19 seconds in front of more than 29,000 spectators at the Saitama Super Arena.The exhibition, organized by Japan's Rizin Fighting Federation and cancelled by Mayweather last month before the 41-year-old reached an agreement with promoters, was set for three…READ FULL ARTICLE