WBO light-heavyweight champion Nathan Cleverly will now defend his title in America on November 10.
Cleverly, 25, will now fight on the undercard of the Abner Mares-Leo Santa Cruz fight in Los Angeles.
"It's a dream come true to defend my title in America," said Cleverly.
"On such a big show, it will take my career to a whole new level. It's a golden opportunity to make a statement that I'm the leading man in this division.
"It will be exciting and challenging to get the recognition of the American media and fans."
He went on to say that he was disappointed about not fighting in front of his home fans in Cardiff.