WBC heavyweight world champion Deontay Wilder (38-0, 37 KOs) has thrown down a challenge on the table to WBA, IBF, IBO heavyweight champion Anthony Joshua (19-0, 19 KOs).
Wilder wants to fight Joshua in a high stakes unification his next possible fight.
Joshua is back on October 28th in Cardiff, when he makes a mandatory defense against Kubrat Pulev.
Wilder is scheduled to return a week later. After the World Boxing Council pulled Luis Ortiz for failing a pre-fight drug test, Wilder will now make a mandatory defense of his own, in a rematch with Bermane Stiverne on November 4, at the Barclays Center in Brooklyn, New York.
Joshua has a television deal in the United States with Showtime, who showcased several of the Brit's fights since last year. And his big knockout win over Wladimir Klitshcko in April, was televised by both HBO and Showtime - because Klitschko had a TV deal with HBO.
Wilder says Joshua is still not a very big name in the United States - and in order to raise that profile with American fight fans - their showdown would have to happen on U.S. soil - although Wilder is willing to face Joshua anywhere.
"To be global, you've got to make your name in America and Joshua is not as big as people think he is over here," Wilder exclusively told Sky Sports.
"The UK is about the size of Texas. One state in my country, where people don't know who Joshua is for real. If my name was brought up and Joshua came along it's the same as if Joshua's name came up, my name would come along.
"It will be a great fight, but he is not that popular over here. I had to burst a lot of people's bubble but he's not. If he wants to be global, he needs to come to America to fight me, but to be honest, I don't care where it happens."