IBF/WBO world heavyweight champion Wladimir Klitschko has broken his silence ahead of this summer's blockbuster unification showdown with WBA king David Haye, and insists he will end the Briton's title reign in the twelfth and final round.

The hard-hitting heavyweights are set to meet on either June 25 or July 2 of this year, and injury-prone Klitschko is adamant he will not only turn up for either date, but will also prolong 'The Hayemaker's pain.

"I will definitely enjoy the fight for twelve rounds,” the 33-year-old Klitschko told BBC Radio Five Live. “Eventually, in the twelfth round, I will knock him out. David - just get in the ring. Don't find an excuse, just get in the ring."

Despite recently withdrawing from two scheduled dates with another Brit, Derek Chisora, the Ukrainian champion anticipates no further injury woes ahead of his summer showdown with Haye. In fact, as rumours continue to link older brother Vitali with a late call-up to face Haye, the determined Wladimir is even more eager to prove his worth as the division's number one heavyweight.

"David Haye thinks Vitali is the toughest one, and that's why he's taking on the younger brother - because he's not that tough. That's why he chose me,” admitted Wladimir.

"You know what? I'm so scared of David Haye. He says he's going to take out my jab; so, I will really feed him with the jab - jab jab grab, jab jab grab, grab, and eventually the right missile is going to land on his chin or his temple or whatever it is."So, I'm sorry guys, but David Haye will get knocked out."