Mega bout bringing in mega pay

The first ticket has yet to be sold, but the richest fight in boxing history is getting richer by the day.

New estimates show Floyd Mayweather's payoff for fighting Manny Pacquiao on May 2 could easily be $180 million - up substantially from earlier predictions of $120 million.

Pacquiao gets the short end of the purse, but even that is expected to be well over $100 million by the time everything is tallied up.