Holyfield postpones fight against Brian Nielsen (AP)

A promoter says a bout between former heavyweight champion Evander Holyfield and Denmark’s Brian Nielsen has been postponed. Promoter Kalle Sauerland says the March 5 fight “has been moved back to May 7″ to allow Holyfield more time to recover from injury. The 48-year-old Holyfield (43-10-2) was cut above the left eye by an accidental head butt during his fight last month with Sherman…