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LAS VEGAS (AP) If Richard Schaefer looked a bit nervous standing near his fighters on a massive stage this week at the MGM Grand, he had good reason.

In a city of high rollers, on one of the biggest betting days of the year, the head of Golden Boy Promotions is taking the biggest gamble of all. He's got $60 million on the line that Floyd Mayweather Jr. and Canelo Alvarez will not only deliver a great fight, but deliver at the box office, too.

He's betting the 152-pound matchup between two unbeaten fighters will be a blockbuster, perhaps the richest fight ever. And right now, there are not a lot of wise guys in this gambling city who would bet against him.