Floyd Mayweather, the greatest boxer of his generation, will take on UFC champion Conor McGregor on August 26 in Las Vegas.
The mega-fight, which will be contested over 12 rounds and which could generate upwards of £500million, was finally confirmed on Wednesday night following weeks of negotiations and months of speculation.
Mayweather will fight for the first time in two years at the T-Mobile Arena while McGregor will box professionally for the first time ever.
UFC president Dana White has claimed McGregor will earn $100m (£78.5m) from the fight while Mayweather is likely to pocket significantly more.
The Irishman currently holds the UFC's lightweight title which he won by stopping Eddie Alvarez in the second round last November.
He is also a former featherweight champion with the organisation and will face Mayweather at the light-middleweight limit of 154lb.
Now 40, the Sin City resident announced he was coming out of retirement earlier this year in order to face McGregor who is 12 years his junior.
The Dubliner agreed to a deal with UFC president Dana White last month to allow him to fight Mayweather in a boxing match.
And through his promotions company, Mayweather reserved the summer date with the Nevada Commission this week.
The fight had been pencilled in for September 16 but Gennady Golovkin and Canelo Alvarez stole a march by booking the same venue for that date.
While Showtime will broadcast the fight live on pay-per-view in the United States, there is likely to be a bidding war between Sky Sports and BT Sport in the UK.
The former won the right to show Mayweather's long-awaited clash with Manny Pacquiao two years ago but BT have recently entered the boxing market alongside promoter Frank Warren and his BoxNation company.
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Do you think they should split the money 50/50?
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