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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