Everything I've heard is that today is the arbitration deadline. Isn't that the same thing? Today is the deadline for offering arbitration to your free agents (Nomar, Burnitz). December 20th is the deadline for offering contracts to all of the players under your control - arbitration eligible guys like Zambrano, Patterson, Hairston, and Macias - and 0-3 guys like Murton, Cedeno, Wuertz, Hill, etc. When you offer ("tender") a contract to an arbitration eligible guy like Macias, you have in effect offered him arbitration. If you don't, you've "non-tendered" him.