Sources from Team Klitschko have informed Boxingtalk.com that WBC heavyweight champion Vitali Klitschko pulled a muscle in his upper thigh running. Klitschko's injury will sideline him  for two or three weeks and has served as the final blow to his on again, off again April 30 showdown with former undisputed heavyweight champion Hasim Rahman, who confirmed to Boxingtalk.com that the fight was indeed off for April 30. Boxingtalk.com will continue to keep you updated.