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V-Mart will both love and hate the deal that Prince just signed. Obviously, signing Fielder is a great addition to the team and vastly improves their offense. The downside: There is no longer a clear spot on the roster for V-Mart.
This season won't prove that much of a difficulty for Martinez, as he will be out recovering from a torn ACL all season. However, when he comes back for the 2013 season, things could get a little dicey. Last season, V-Mart played the vast majority of his games as the DH for the Tigers. Now, the plan is to use either Miggy or Prince in the DH slot, with the other starting at 1B.
With both the emergence of Alex Avila at catcher and the injury that Martinez suffered, it is unlikely that he will see a lot of time at catcher in the 2013 season. Deteriorating knees is always a concern for catchers, so for V-Mart to get back behind the plate after tearing his ACL is unlikely.
Unless he learns a new position (third base? LF/RF?) or Miggy returns to third base (early reports indicate that is a possibility), there is no clear position for Victor Martinez in 2013.