Klitschko calls off Chisora fight

BOXING: Wladimir Klitschko has pulled out of Saturday’s fight with Dereck Chisora and opened negotiations for a world heavyweight title clash with David Haye. Klitschkos cited a back muscle problem last night. Golden Boy Chief Executive Richard Schaefer said: “Wladimir’s people told us that the fight this weekend is off and asked us to start making the big one with David.”