Diamond Sports Group, the largest owner of regional sports networks, filed for bankruptcy protection on Tuesday, toppled by a more than $8 billion debt load. The company, which is an unconsolidated and independently run subsidiary of Sinclair Broadcast Group, filed for chapter 11 bankruptcy protection in Texas. The company said in a release it is finalizing a restructuring support agreement with a majority of its debt holders and Sinclair to wipe out its debt load.