Mayweather said in the build-up he expected to pocket 9million USA dollars from the fight and fans immediately took to social media to react after the 41-year-old made all that for just a couple of minute's work.
But the bout at the top of the card attracted the most global attention, as Mayweather stepped back into the ring against undefeated - but undersized - kickboxing star Nasukawa in an exhibition boxing match.
The rules were very strictly defined: three, three minute bouts and boxing only - kickboxer Nasukawa was reportedly facing a US$5 million fine if he aimed a kick at Mayweather. I am still retired, I don't look to come back to boxing.
"What if I told you I was making $9,000,000 for 9 minutes of sparring in Tokyo Japan would you do the same if you were me? You guys have been wonderful, thank you".
The size difference was readily apparent between the two as Mayweather was the taller, bigger, and longer boxer.
The American made the paying crowd wait, turning up over two hours late to the stadium before emerging for the fight.
More than anything, though, Pacquiao hopes beating Broner lures Mayweather (50-0, 27 KOs) out of retirement for a rematch later in 2019.
After the fight, Mayweather said: "It was all about entertainment". After Nasukawa was knocked down for the third time, Nasukawa's corner threw in the towel to put a halt to the contest.
For anyone who actually paid for the event specifically to see Mayweather assault Nasukawa, you got what you deserved.
But Nasukawa never landed a meaningful punch. "I'm still undefeated. This was just entertainment for the people". Tenshin is a hell of a fighter and he's a great champion.