Floyd Mayweather made light work of Tenshin Nasukawa by beating the Japanese kickboxer in the first round of their exhibition fight.
Mayweather, who earned $9 million (£7m) for the contest, knocked down Nasukawa three times in the opening round and the bout was stopped with around 40 seconds remaining.
The fight, which was held in Saitama, Japan, was scheduled to last for three rounds but Mayweather quickly swept aside his opponent.
Nasukawa, who is an undefeated kickboxer and MMA fighter, started brightly but dropped to the canvas inside the opening 70 seconds following a left hook from Mayweather.
The 20-year-old staggered to his feet but was knocked down once again by an excellent right uppercut from Mayweather just 40 seconds later.
Mayweather then finished the contest with swift left-right combination which dropped Nasukawa for a third time.
After the victory which does not go towards his 50-0 boxing record, Mayweather insisted that he was still retired.
I want to say thank you to Tenshin. This dont go on our record, said the 41-year-old.
We are both still undefeated. He is a great champion and a great fighter. I am still retired, I dont look to come back to boxing.
I came back for entertainment for the people of Japan.