Wladimir Klitschko, IBF World HEavyweight champion
 
Wladimir Klitschko has pulled out of his world heavyweight title defence against British champion Dereck Chisora due to a reported back injury.
 
Klitschko had been set to fight Chisora in Mannheim Germany on Saturday night, as part of the SkySports promoted Britain vs The World.
 
A torn muscle in his back has seen the bout to be abandoned. The Ukrainian champion now faces more than a month out before he can begin training again.