"Money" Mayweather has hinted on social media he was pocketing US$9 million for the fight, meaning he earned around US$4.5 million per minute for the spectacle. Nasukawa, who is a kickboxer, was not allowed to use those skills in the fight, giving Mayweather a clear advantage. He was gracious in victory, hugging the weeping Nasukawa and calling him "still a great champion".
The fight, which was held in Saitama, Japan, was scheduled to last for three rounds but Mayweather quickly swept aside his opponent.
Set at a weight limit of 147 pounds, there were no judges in attendance and it did not count toward the professional record of either fighter.
This was just an odd matchup and fight when it was announced.More news: Merkel, Macron urge Ukraine seamen freed
Therefore, Mayweather said: "Tenshin is still undefeated".
The rules were very strictly defined: three, three minute bouts and boxing only - kickboxer Nasukawa was reportedly facing a US$5 million fine if he aimed a kick at Mayweather. "Would you do the same if you were me?" This won't go on Tenshin's record.
However, "Money" didn't need nine minutes to collect his pay cheque, dispatching the Japanese sporting hero with a barrage of combinations in the opening round.
Mayweather, who hadn't fought since beating UFC star Conor McGregor more than a year ago, said he was retired and came to Tokyo to give an opportunity to a younger fighter like Nasukawa. "I'm still retired, I'm still 50-0, and Nasukawa is still undefeated and a hell of a fighter".