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Boxer Floyd Mayweather Jr. (L) and MMA figher Connor Mcgregor pose during a media press conference August 23, 2017 at the MGM Grand in Las Vegas, Nevada. 
Mayweather, the 40-year-old undefeated former welterweight boxing champion, has been lured out of retirement to face McGregor, a star of mixed martial arts' Ultimate Fighting Championship. The two men meet in a 12-round contest under boxing rules on August 26th that is tipped to become the richest fight in history.
 / AFP PHOTO / John Gurzinski        (Photo credit should read JOHN GURZINSKI/AFP/Getty Images)
Boxer Floyd Mayweather Jr. (L) and MMA figher Connor Mcgregor pose during a media press conference August 23, 2017 at the MGM Grand in Las Vegas, Nevada. 
Mayweather, the 40-year-old undefeated former welterweight boxing champion, has been lured out of retirement to face McGregor, a star of mixed martial arts' Ultimate Fighting Championship. The two men meet in a 12-round contest under boxing rules on August 26th that is tipped to become the richest fight in history.
 / AFP PHOTO / John Gurzinski        (Photo credit should read JOHN GURZINSKI/AFP/Getty Images)

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The money behind Mayweather v. McGregor

The highly anticipated bout between Floyd Mayweather and Conor McGregor could lead to one of the biggest purses ever. CNNMoney's Ahiza Garcia breaks down the money behind the fight.

The money behind Mayweather v. McGregor

The highly anticipated bout between Floyd Mayweather and Conor McGregor could lead to one of the biggest purses ever. CNNMoney's Ahiza Garcia breaks down the money behind the fight.