The American said in quotes published by BBC Sport: "It was all about entertainment - we had a lot of fun".
Rather, he was on his feet at the time of the stoppage so he can definitely come again without the fear in the back of his mind of having been knocked out viciously - which can often then make a fighter gun shy in future fights. Toyko, Japan - you guys are unbelievable - I want to say "Thank you". I'm still 50-0. Tenshin is still undefeated. The plan, Mayweather and Pacquiao had both said, would be to still fight a rematch sometime in 2019, a Pacquiao victory being assumed. The two took part in an exhibition fight that was clouded in uncertainty as to whether or not it was ever going to really happen.
It was announced that the bout would be nine minutes of boxing (3x 3 minute rounds) AND the result won't count on either fighter's record.
"I want to say thank you to Tenshin".
Mayweather, who lives in Las Vegas, distanced himself from the promotion in November but turned up for the boxing-rules contest that was the last of 14 bouts.
Mayweather was late to arriving at the Saitama Super Arena in Saitama, Japan and the co-main event and main event of the Rizin card was delayed until his arrival. When he finally did, there were protracted preliminaries before less than three minutes of action.
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But Mayweather changed his tune after knocking out Nasukawa, who is 27-0 with 21 knockouts in kickboxing and 4-0 with two knockouts in MMA. "I'm still undefeated. This is just entertainment for the people", he added. Mayweather landed a good body shot and a left hook and Nasukawa goes to the mat.
Mayweather began smiling and relaxed.
Instead, to his credit, he showed true class and had some very kind words for Nasukawa.
Nasukawa was reportedly crying during the post-fight interview.
The opening round starts off with Nasukawa circling towards the left jab of Mayweather, who had a big smile on his face and was slowly walking Nasukawa down.