Although the fight was announced, several key details were not, including the specific rules of the bout, the number of rounds, the weight limit, how the fight broadcast would be distributed and what type of gloves they would wear.
Mayweather last fought in August 2017 when he won a 10th round TKO against Conor McGregor, who crossed over to boxing for the fight that became the second biggest pay-per-view of all time. It would be shocking if Mayweather did anything other than fight under boxing rules, as he did with McGregor.
Although the ruleset and weight class for the shock bout haven't been announced, Mayweather has insisted they will "get situated" in the coming weeks.
The 20-year-old with a bleached-blond quiff called it an "easy decision" to accept the offer to face Mayweather in Saitama, north of Tokyo.
That victory improved his boxing record to a flawless 50-0, but the format or rules for his meeting with the baby-faced Nasukawa were not specified by the Japanese mixed martial arts promoters RIZIN. "I look forward to giving you guys entertainment come December 31, but my relationship with Rizin doesn't just stop here". When it's all said and done, it's all about me going out there displaying my skills against another skilful fighter.
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Rizin Fighting Federation are co-promoting the fight, which has been dubbed a "Super Challenge" bout.
It is unclear what rules be in place when Mayweather and the undefeated Nasukawa enter the ring, but Mayweather has indicated that he is in the midst of determining this with the promotion company, Rizin FF. Rizin's president Nobuyuki Sakakibara announced that the fight is likely to occur using "special rules". Are you excited to see it?
"I can wrestle, I can wrestle little bit". Nobody has defeated my opponent in the past and I'd like to be the man who makes history. "I can do anything if I set my mind to it".
"I just want to entertain". "I think that when it comes to experience, I have more experience on my side". "He's young, fast, [has] youth, undefeated like myself, and what the people want is excitement and that's why I chose Japan".
ESPN reporter Ariel Helwani said it was unlikely to be an MMP bout.