Mayweather stops Nasukawa in 1st round, flooring him 3 times

Japanese kickboxer Tenshin Nasukawa lies on the mat after being knocked out by Floyd Mayweather Jr. during first round of their three-round exhibition match on New Year's Eve, at Saitama Super Arena in Saitama, north of Tokyo, Monday, Dec. 31, 2018. (AP Photo/Koji Sasahara)

SAITAMA, Japan — It took less than three minutes for Floyd Mayweather to knock down his Japanese kickboxer opponent Tenshin Nasukawa three times in a totally one-sided bout of exhibition boxing on New Year’s Eve.