RIZIN 14 is scheduled for December 31, 2018, live from the famed Saitama Super Arena in Saitama, Japan.
"It wasn't easy to make this happen", Mayweather said, "but we told the people anything is possible, so now we're here and we wanna make sure that we give the people in Tokyo what they wanna see - blood, sweat and tears".
There's a long history of fighters, especially boxers, extending their careers long past when the likely should have - see: Jones Jr., Roy - but Mayweather is going in a new route with his post-initial retirement fight tour as he's taking the big check to take on fighters from other disciplines.
"As far as the weight class and the rules, we will talk about that and will get that situated within the next couple of weeks", Mayweather added.
In the meantime, Mayweather will take on Nasukawa, who is 27-0 with 21 knockouts in kickboxing and 4-0 with two knockouts in MMA.
Instead, Mayweather explained that the decision to fight in Japan was about expanding his global profile.
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Mayweather expects a good fight against Nasukawa, who won his last kickboxing bout against compatriot Kyoji Horiguchi at RIZIN.13 in September.
The Rizin Fighting Federation was founded in 2015 by Japanese businessman Nobuyuki Sakakibara, who was previously the president of Pride Fighting Championships before it was sold to the then-owners of Ultimate Fighting Championship in 2007.
Speaking about the event at a press conference, Mayweather said, "I want to continue to build my relationship with Money Team Tokyo".
"We still have more work cut out for us, but we think it will be a great fight everyone will be excited to see", Sakakibara said through a translator. "When I was offered this card, I accepted it right away without any delay whatsoever".
"I can wrestle, I can wrestle little bit. I can do anything if I set my mind to it". "My punch can change history and I will show that to you".
"I wanted to do something different".
ESPN reporter Ariel Helwani said it was unlikely to be an MMP bout.