Money Mayweather stepped up to the challenge of facing undefeated 20-year-old kickboxing sensation Nasukawa in this three-round bout but in truth it was never going to last that long with the two fighters way off in terms of boxing ability.
Mayweather set the rules for the boxing-only fight, which included a $5 million fine if Nasukawa aimed a kick at him.
Mayweather is confident that he could do three rounds in his sleep and will welcome the lucrative payday for what should be a routine trip through the ropes. "We had fun", Mayweather said in the ring after the event. The bleach-blond kickboxer, who made his professional debut at age 16, said before the fight: "I want to be the man who changes history".
Nasukawa looked completely out of his depth in his first boxing fight, swinging wildly in an attempt to land a blow on his opponent. Only a knockout or technical knockout was considered a victory, according to The 42. This don't go on my record - this don't go on Tenshin's record. "I like to call it a 9-minute walk thru".
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Mayweather, 41, a former five-division world champion, floored Nasukawa three times before the end of the first round.
Virtually unknown outside the kickboxing ring in his own country, Nasukawa from Chiba near Tokyo also boasts an unbeaten record.
He has gone 27-0, including 20 knockouts, as a featherweight kickboxer and 4-0 in MMA matches (two KOs, one submission). He was gracious in victory, hugging the weeping Nasukawa and calling him "still a great champion".
Monday's Tokyo fight was on-off from the start.
Nasukawa and promoter RIZIN Fighting Federation's had hoped to become better, broader brands by beating the aged Mayweather.