WASHINGTON, Jan 13 (Reuters) - The U.S. Federal Reserve announced on Tuesday it had approved the acquisition of regional lender Comerica CMA.N by Fifth Third FITB.O, an all-stock deal valued at $10.9 billion that would create the nation's ninth-largest lender.

The deal was originally announced in October, and would mark the largest bank deal of the year.

(Reporting by Pete Schroeder; Editing by Chris Reese)

((pete.schroeder@thomsonreuters.com))