There had been doubts as to whether the fight would take place but the Money Man confirmed in November that he will appear at the top of the RIZIN 14 card in Saitama.
And on Thursday he posted an Instagram promo video for the big event.
When is Mayweather vs Nasukawa?
Floyd Mayweather will fight Tenshin Nasukawa on New Year's Eve.
A lengthy undercard featuring MMA, kickboxing and shootboxing begins at 3pm local time – 6am UK time.
There will also be another event – Rizin: Heisei's Last Yarennoka – held before the Mayweather undercard begins.
The exact ring walk time for the Mayweather bout is yet to be confirmed, but expected around 10am UK time.
Is Mayweather vs Nasukawa on TV and can I live stream it?
As things stand, Mayweather vs Nasukawa is set for a TV blackout in the UK.
In North America, the Rizin 14 event will be live on Fite TV, but this will not include Mayweather vs Nasukawa.
A PPV broadcaster has yet to agree rights for the fight with RIZIN as of December 23.
What are the rules for Mayweather vs Nasukawa?
Mayweather vs Nasukawa will be a boxing match and take place over three rounds.
No kicking or MMA moves will be allowed from the Japanese fighter.
As it is an exhibition match, both fighters will remain unbeaten… even if they lose.
Dan Rafael, of ESPN, provided further details.
He said: "The fight will take place at a contract weight of 147 pounds, the welterweight division limit, with boxing-standard three-minute rounds.
"The fighters will wear 8-ounce Rizin-brand boxing gloves. Because the fight is an exhibition, whatever happens will not count on either fighter's official record.
"No judges will be employed, so if it goes the distance no scores will be rendered."
When is the weigh-in?
There will be no weigh in for Mayweather vs Nasukawa as it is not an officially sanctioned fight.
Tenshin Nasukawa vs. Floyd Mayweather Jr.*
Kyoji Horiguchi vs. Darrion Caldwell
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Rena Kubota vs. Samantha Jean-Francois
Yusuke Yachi vs. Johnny Case
Ulka Sasaki vs. Manel Kape
Yuki Motoya vs. Justin Scoggins
Nobumitsu Osawa vs. Tofik Musaev
Jiri Prochazka vs. Brandon Halsey
Justyna Haba vs. Shinju Nozawa Auclair
Damien Brown vs. Daron Cruickshank
Mika Nagano vs. Miyuu Yamamoto
Gabi Garcia vs. Barbara Nepomuceno
Kazuyuki Miyata vs. Erson Yamamoto
Rizin: Heisei's Last Yarennoka
Tatsuya Kawajiri vs. Satoru Kitaoka
Kai Asakura vs. Jae Hoon Moon
Kana Watanabe vs. Shizuka Sugiyama
Yuta Uchida vs. Takuma Konishi**
Nanaka Kawamura vs. Ai Shimizu
Mikuru Asakura vs. Takeshi Inoue
Taiju Shiratori vs. Yoshiya Uzatsuyo
What have the fighters said?
Mayweather: "I'm in the entertainment business. That's what I go out there to do. I love to do this. I’m working out to put on a show for three rounds. I'm going to go out there, have fun and do what I do. I'm enjoying life and I'm going to enjoy this experience."
Nasukawa told Rafael: "I'm training hard every day to face Mayweather and leave a mark.
"This is a great opportunity and we're happy to take it. I'm going to put everything out there and show my strengths. I think that I'm the faster fighter. I'm going to use my weapons against him."
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