Ahead of Saturday's fight between Floyd Mayweather and Conor McGregor, the CEO of Floyd Mayweather's gym business, which will start launching in November, has one big prediction.

"I am fully confident in Floyd's victory on Saturday," said James Williams, CEO of Mayweather Boxing and Fitness. "I think Floyd is the greatest boxer of all time. Every time he steps into the ring, he's confident that he is going to win. I think he knows he's going to win."

The boxing match airs at 9 p.m. Eastern on Saturday.

Mayweather vs. McGregor: The Fight of the Century

Editors' pick: Originally published Aug. 25.

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