Sergio Martinez insists Martin Murray will not hear the final bell when they clash in Buenos Aires, Argentina on Saturday night.
Murray, from St Helens, England, takes a step up in class when he faces the WBC middleweight champion in front of more than 40,000 fans.
And Martinez says the British puncher will be flying back home empty handed – after he’s been knocked out.
"We have watched tapes of Martin Murray’s past fights, he is a come forward boxer and will give me a good challenge in the ring, but it will not be enough," Martinez, who is boxing on home soil for the first time in over a decade.
"The way I see this fight playing out in my mind, I will KO Murray in the eighth round.
"Some people have said Murray is facing me at the right time. Well, those people are in for a surprise on April 27.
"I might be 38 years old of age, but my body does not feel like it. I take care of myself mentally and physically. I am constantly in the gym working out even when I do not have a fight lined up in order to keep my body in shape.
"Also my fighting style has allowed me to not age in the boxing ring.
"My goal is to be the number one pound for pound boxer in the world and I will not stop until I reach that goal."