(Renton, WA)  --  Seattle Seahawks cornerback Richard Sherman is reportedly close to an agreement with the team on a contract extension that would make him the highest-paid cornerback in the NFL.  CBS Sports reports Sherman could sign the deal before the April draft.  The extension could pay Sherman more than 13-million dollars a year, far above the one-point-five-million in total compensation he's due to receive from the Seahawks in 2014.