Raiders give Amerson big raise, four-year extension

The Raiders have signed cornerback David Amerson to a four-year contract extension, NFL Network’s Ian Rapoport reported. The report said Amerson’s deal is worth as much as $38 million and includes almost $18 million in guarantees. A second-round pick of the Redskins in 2013, Amerson was cut by the Redskins two games into the 2015…