Talk heating up between Floyd Mayweather and Canelo Alvarez

Two of boxing's biggest superstars will meet Sept. 14 in one of the sport's biggest bouts in years when Floyd Mayweather and Canelo Alvarez will face off in a battle to determine the world's best boxer. 

Showtime's All-Access provides exclusive looks at the lives of both fighters -- their similarities, their differences, and, most of all, their respective desire to win.

"Here I am with the most important opportunity of my life," Canelo says. "I'm very happy. I'm grateful to the people who support me wherever I go. I need to repay them with a victory."

Mayweather is, unsurprisingly, more bombastic in his day-to-day life. Still, the undefeated fighter dishes out some respect to his likewise perfect counterpart.

"He's a young champion, and he's earned his right to be up here with me," Mayweather is seen saying to a crowd at Madison Square Garden. "And come September 14, it's the best versus the best."

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