Former world champion Floyd Mayweather will come out of retirement to face MMA fighter Conor McGregor on August 26 in Las Vegas. Floyd confirmed he is in on social media. The contest will take place under boxing rules, and would officially bring Floyd’s record to a record 50-0 if he wins as expected. The number of rounds hasn’t been determined. McGregor will be making his pro boxing debut. Showtime will handle the PPV.