The famous sportsman will fight with the Japanese Tensin Nasukawa in the tournament Rizin 14, which will be held on December 31 in Japan. The match has been called a "Super Challenge", and many details (including the rules, weight limit, number of rounds, and what kind of gloves the fighters will wear) are now unknown.
Nasukawa is on of Rizin's leading stars, holding a 4-0 MMA record, but being best known as a kickboxer who holds a ideal 27-0 record.
Mayweather posted a teaser photo on his Instagram feed at the weekend, showing him wearing kickboxing gloves.
Mayweather, who stopped McGregor in the 10th round past year after coming out of retirement for a $275 million pay day, had been flirting with the idea of a rematch with the Irishman or facing fearsome Russian Khabib Nurmagomedov.
Speaking at the press conference, Mayweather praised his proposed opponent and provided a glimpse into why he took the bout. With an exhibition bout expected, Rizin's promoter, Nobuyuki Sakakibara, did offer that the fight would be under "special rules" but offered no news on whether there would be a proposed weight class or the fight would operate under an open weight.
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"As a professional I haven't had a chance to go outside the U.S. to display my skills and to display my talent for the world".
"I think he's young, very strong and very fast and he undefeated so it's obvious he's doing something right", Mayweather said. I'm pretty sure that will get sorted out in the next couple weeks. "I wanted to display my skills outside the USA and be in a special fight".
He also vowed to end Mayweather's long string of victories.
"I would probably say that this is my biggest event in life, so far", Nasukawa said, via a Japanese translator.
"Honestly it was surprise offer but I accepted without hesitation", said Nasukawa. "I will show that to you, so please stay tuned".