Attention: I am NOT saying Mayweather should take a dive
A lot of people have been saying Mayweather might take a dive or carry CM awhile to make the match seem competitive and he could then do a rematch for some more money.
I would say the best thing he could do is completely embarrass CM, I mean rag doll his head for the whole first round like Silva did to Overeem when he KOd him. If he does this he preserves his legacy, but he also poses the question, maybe he could beat CM in the octagon. So then they can come back with a rematch with MMA rules and there would be a lot of interest. The way I figure it even if Mayweather makes 400 million this fight he's still fighting for free. He owes 200 mill in back taxes and would still owe 200 more mill for 2017 taxes.