Weak operating performance at U.S. wireless carrier Sprint Nextel Corp. has led to deteriorating credit measures. We are placing our 'BB' rating for the company on CreditWatch with negative implications. The CreditWatch listing reflects the potential for a one-notch rating downgrade if the company does not show prospects of improving credit measures in 2010. On Nov. 11, 2009, Standard&Poor's Ratings Services placed its 'BB' corporate credit rating for Overland Park, Kan.-based wireless carrier Sprint Nextel Corp., as well as all related issue-level ratings on the company's debt, on CreditWatch with negative implications. This indicates that we could either lower or affirm the ratings following the completion of our review. The CreditWatch listing is based on the company's weak