The rules for the three-round contest — organized by The Rizin Fighting Federation and held at Saitama Super Arena on the northern outskirts of Tokyo — were no kicking allowed and no official record of the match.

Therefore, Mayweather said: “Tenshin is still undefeated. I’m still undefeated.”

Mayweather has won all 50 of his pro fights, while Nasukawa has an undefeated record in kickboxing and mixed martial arts.