The MLB Players Association announced today that 146 players have filed for arbitration. That list includes all six Pirates who were eligible: Pedro Alvarez, Vin Mazzaro, Mark Melancon, Gaby Sanchez, Travis Snider, and Neil Walker. The process to file for arbitration is only a formality, and isn't really significant. The significant move this week will be when the teams and players exchange figures on Friday.

Once the two sides exchange figures, a deal usually follows. The sides tend to meet somewhere in the middle. If they don't meet in the middle, the two sides go to an arbitration hearing. In that hearing they each argue for their salary figure, and an arbiter decides which salary represents the player's value. The Pirates have gone to arbitration with players in the past, although i...

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