Since defeating Conor McGregor in a boxing ring a year ago, Floyd Mayweather has continuously teased participating in a mixed martial arts fight, regularly suggesting he would take on McGregor in a rematch or set a bout with Khabib Nurmagomedov.
Floyd Mayweather Jr.'s retirement from fighting ended last year when he faced Conor McGregor in a megafight that, like most all of Mayweather's bouts in recent years, failed to live up to the hype.
In an interview on Saturday, the 41-year-old said he would be comfortable fighting under any format.
Now it looks like Nasukawa will step onto the biggest stage of his career for a showdown against Mayweather on December 31 in Japan. "I'll do that with these fists, with one punch - just watch". So we both want to go out there and display our skills and give people excitement.
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.
He added: "You might be surprised after hearing this announcement, and honestly speaking I'm a little surprised myself".
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"Rizin has done a phenomenal job with the fighters", Mayweather said.
"Nobody has defeated my opponent in the past and I'd like to be the man to make history". When it's all said and done, it's all about me going out there displaying my skills against another skilful fighter.
The fight will also mark the first time that Mayweather, a famous creature of habit, has fought outside of his adopted home of Las Vegas since his 2005 bout against Sharmba Mitchell at the Rose Garden in Portland, Oregon.
"We'll talk about that, we'll get that situated within the next couple weeks", Mayweather said when asked Monday about the weight and the rules. "Boxing rules I wouldn't mind".
"(Then) Nasukawa Tenshin was the first guy we could think of, and the only guy we can think of (for this match)".
"It's always been a goal of mine to go outside the USA and go into another arena and display talent as a professional because I did it as an amateur".
Information from ESPN's Ariel Helwani was used in this report.