Saul “Canelo” Alvarez and Floyd Mayweather Jr. will tangle Sept. 14 in a junior middleweight title-unification bout at MGM Grand in Las Vegas (on Showtime pay-per-view). If Alvarez hands Mayweather (44-0, 26 KOs) his first defeat, Richard Schaefer believes the aftermath could be unprecedented.

Alvarez, just 22, is treated like a rock star in his native Mexico. He also has a huge following in the U.S., what with its large population of Mexicans and Mexican-Americans.

“If ‘Canelo’ wins, can you imagine what that would do?” said Schaefer, CEO of Golden Boy Promotions, which promotes Alvarez. “Oh my gosh. He sold 40,000 tickets (for his fight against Austin Trout in April in San Antonio) before beating a Mayweather. So can you just imagine? I can see him fighting at the Coliseum right here in downtown Los Angeles in front of 150,000 people and setting an all-time record.”

Alvarez is 42-0-1 with 30 knockouts.