Espinoza said the fight came together quickly after McGregor and the UFC reached agreement last month on their end of the deal and Mayweather's team pushed for the fight in recent days.
Mayweather is a -1,100 favorite at the Westgate SuperBook in Las Vegas, with McGregor paying back +700.
The boxing format heavily favours the undefeated Mayweather (49-0, 26 KOs) who many consider to be the best pound-for-pound fighter in the world. But the reason Conor McGregor's as big as he is is he'll fight anybody, anywhere, anytime.
The fight, which will be McGregor's first professional fight inside a boxing ring, is widely expected to be the highest grossing bout of all time, with the Irishman set for the biggest payday of his career by far, with $100 million set to come his way. Mayweather and McGregor eventually went back and forth with each other in the media and on social media talking about a possible fight, but making a deal was another story.
London tower blaze likely killed at least 58 people
Some Grenfell residents had warned months ago fire safety issues at the tower meant that it was at risk of a "catastrophic" event. So, the residents are saying that the final death toll could be much higher than the figure what British authorities are giving.
South Korea president criticizes North on death
Justin Weber told The Associated Press that a news conference is expected later to provide more information. He died Monday in Cincinnati. 'I can not understand what the Warmbier family is feeling right now.
Trump scolds Qatar on terror
Turkey set up a military base in Qatar, its first such installation in the Middle East , as part of an agreement signed in 2014. The reaction comes after Saudi Arabia issued a statement demanding Qatar end its ties with the Muslim Brotherhood and Hamas.