James DeGale insists that he will knock out Commonwealth super-middleweight champion George Groves inside four rounds when they meet on May 21 at the O2 Arena, London.
And DeGale's trainer Jim McDonnell even predicts the fight could be over in three minutes.
"I will knock out Groves inside four," said DeGale.
"The only way he can last more than that is if he runs from me for 12 rounds, and that's not going to happen."
And McDonnell added: "This could all be over in the first round.
"If James doesn't knock him out then, it will all be finished by the fourth anyway.
"George Groves' team should protect him and pull him out now. He is at least two years away from challenging James."