If the CBA allows for such a maneuver, what would be the basis for their greivance? The article doesn't say. My guess is that arbitration must be entered into with good faith. The PA could argue he's only being released because he won his hearing. They might argue if the Padres didn't want to take the risk of losing arbitration they should never have offered. I'm not sure of the nuiances of the CBA, but my guess is it would revolve around a "good faith" clause. I don't buy the good faith argument. Clearly the CBA has an out clause for exactly this situation. It is not like Walker is going to walk away empty handed. He is going to get 1/6 of his salary without having to do a thing. How would you feel if your boss fired you for getting a raise and decided to give you two months salary when he fired you? Walker's agent should have informed him this was a possibility of happening before he accepted arbitration. His union gave away that right, and they can't be upset about it now just because it might possibly be used. I would feel bad about it (your analogy of getting fired, but I would have to accept it if it was in my contract, and I can't see how their challenge will result in anything but possibly eliminating that in the next CBA. The process of arbitration is agreed upon by both parties, on good faith that the result of the hearing will be abided to. Releasing Walker after he won an arbitration case is not bargining in good faith. I agree. If the Padres didn't want Walker, they didn't have to offer him arbitration. By offering, the Padres hurt his chances of signing since he was a Type A FA. Walker accepted because teams were not wanting to meet the draft pick price of signing him. The Padres took the risk also knowing the consequences. Whether or not the grievance has a legal standing, I don't know. I don't know the nuiances of the CBA nor am I lawyer capable of commenting on them. However, I can clearly see if Walker is released as early as March 15 where he could argue that arbitration was not entered in good faith.