Tenshin Nasukawa's corner threw in the towel late in the first round during the kickboxer's exhibition boxing match against Floyd Mayweather in Tokyo.
Mayweather knocked the 20-year-old down three times in just over two minutes of the fight which was taking place on the Rizin 14 card.
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Mayweather said before the event that he was set to make $9 million for a bout which was scheduled to take place over three, three minute rounds.
Nasukawa, who is undefeated as a kickboxer, is a huge star in Japan.
The rules of the fight stated that it will not go on the official record of either competitor.
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