Showtime is reportedly off to a great start making good on that promise.
According to ESPN's Dan Rafael, Mayweather's contract for his May 4 bout against Robert Guerrero, which was filed with the Nevada State Athletic Commission on Friday, promises a guaranteed purse of $32 million for Money May.
That mark ties the single-highest guarantee for a boxer in history (which Mayweather set last year in his bout against Miguel Cotto).
However, that $32 million is only what's guaranteed to Mayweather. He stands to make a boatload more if the pay-per-view buys come in as expected.
Golden Boy chief executive Richard Schaefer spoke with Rafael and noted Mayweather will keep "90 percent" of the profit from Saturday's fight:
I think when you see a total like that it speaks for itself. He has established clearly that level of $32 million as a guarantee and remember: He will make much more after everything is counted because he keeps 90 percent of the profit from the event. The $32 million is just the contract minimum. The bulk of everything else goes to him.
Mayweather (43-0, 26 KOs) will be entering the ring for the first time in nearly a year to face Guerrero (31-1-1, 18 KOs) on Saturday. The fight will take place at the MGM Grand Hotel & Casino in Las Vegas, making this the seventh straight Mayweather bout to be held at that venue.
Saturday's bout will be the latest financial windfall for the 36-year-old fighter, who has become indisputably the most bankable name in boxing. Forbes listed him as the highest-paid athlete in all of sports last year, having made $85 million over a 12-month period that included fights against Cotto and Victor Ortiz.
It will also mark the first in Mayweather's new 30-month contract with Showtime, which allows him up to six fights over that period. The deal marked an end to Mayweather's longstanding relationship with HBO, which had aired each of his last nine fights.
According to Forbes’ Kurt Badenhausen, those fights generated 9.6 million purchases and $543 million in revenue for HBO.
Rafael notes that Showtime expects at least 1 million pay-per-view buys against Guerrero, who has a lower profile than most of Mayweather's recent opponents.
Mayweather will reportedly fight again on Sept. 14 against an opponent yet to be determined. And if his Guerrero contract is any indication, Mayweather may well keep his spot atop the Forbes list if that date sticks.