Amazon.com (AMZN +0.9%) -- already a key part of the discussions around a multibillion-dollar sale of the New York sports network YES -- is in talks to join Sinclair Broadcast Group (SBGI +1.1%), the New York Post reports, in what would be a leading bid to acquire the other 21 Fox regional sports networks.

The 22 RSNs are being sold by Disney (DIS +1.5%) as a regulatory requirement for the Mouse House's game-changing acquisition of Twenty-First Century Fox's media assets, though the price is now falling far short of Disney's hopes.

Sinclair is trying to win Amazon's backing as it preps a $9B all-cash bid for the non-YES sports nets, according to the report.

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