These athletes have all made plenty of money on the field, but just as much (or more) off of it, thanks to some smart business sense.

Floyd Mayweather put together a fantastic boxing career, but his real estate portfolio is shaping up to be even more impressive.

Back in 2006, Floyd Mayweather made a very risky $750,000 bet on himself. That wager would eventually earn him over a billion dollars...

Taking his talents to UFC is an idea that Mayweather has floated in the past, but in actual likelihood, the odds of it happening any time soon don't seem high.

Just because Floyd Mayweather is "retired" from boxing with a net worth of $560 million, doesn't mean he's retired from the smack-talking business.

Step aside A-Rod, Messi, Ronaldo LeBron, Kobe. Mexican boxer Saul "Canelo" Alvarez just signed the largest contract in sports history.

On Saturday, Floyd Mayweather defeated Conor McGregor. Going into the fight, Mayweather had career earnings of $765 million. With a reported payday in excess of $300 million from Saturday, Mayweather joins ranks of athletes who've made a billion...

They call him Floyd "Money" Mayweather for a reason.

It's hard to even fathom, but after the Conor McGregor fight, Floyd Mayweather career earnings could top $1 BILLION. Related article: Floyd Mayweather Net Worth

On Saturday, one of the most anticipated fights of all time is going down at Las Vegas' T-Mobile Arena. Floyd Mayweather takes on the UFC's Conor McGregor. Mayweather will see his net worth shoot up dramatically Saturday night.

Floyd Mayweather, Jr. has been on the boxing scene since the mid- 1990s. He's had an enormously successful career, beaten a who's who of boxing over the past 20 years, made boatloads of money, and spent a ton of money.

Back in 2006, Floyd Mayweather was still an up and coming fighter with a modest amount of money in the bank. He made one simple – yet very risky – move that changed everything.

The Floyd Mayweather/Conor McGregor "super-fight" is generating a lot of hype... is there any possible way it can live up to it?

Are we entering a new renaissance for boxing? The return of the long dormant heavyweight division could usher in the era of the billionaire boxer.

The average career of a professional athlete is pretty short. That makes the earnings of the highest paid athletes of all time even more impressive!

Boxing purses started out at a modest level, but they've since grown to astronomical proportions. Just how high have they gotten?

Shane Mosley says that he has "millions in the bank… but I'm no Mayweather" and he was likely referring to the way Floyd spends his money so fast.

The world is wondering if Floyd Mayweather is serious about retiring, now that he has tied Rocky Marciano's 49-0 record, but after making $695 million over the course of his career what does he have to fight for?

Over the years, there have been a number of athletes who have failed at making the transition, but there have been many that have succeeded in making the shift from athlete to entrepreneur.

Floyd Mayweather Jr. is still claiming that his next fight is going to be his last and that it will not be a rematch against Manny Pacquiao. However, if he wants one last monster payday, he may not have a choice.

All the PPV numbers have finally been tallied, here's exactly how much revenue the Mayweather-Pacquiao fight generated and how much each fighter will make..

Forget $150 million. Forget $200 million. Based on the most recent PPV sales stats, Floyd Mayweather is now looking at a $280 million payday...

Floyd Mayweather and Manny Pacquiao will FINALLY face off on May 2nd 2015. Let's take a look at how their career earning match up right now.

From ticket sales to Pay Per View to beer sponsorship, Floyd Mayweather and Manny Pacquiao are about to SHATTER records.

Boxers not only chase titles in their weight division, they also covet the title of Pay-Per-View King. And these men are the Kings of all PPV Kings!!!