Caesars Entertainment Corp., the U.S. casino company, put its main operating unit into bankruptcy in Chicago today, setting up a showdown with dissident creditors who filed a competing case in Delaware.

The second Chapter 11 filing for the unit this week follows months of negotiation and litigation over how best to reduce the billions of dollars of debt assumed in a 2008 buyout that was arranged by Leon Black’s Apollo Global Management and David Bonderman’s TPG Capital Management.

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