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By my count. Avila, Santana, McCann, Wieters, Miguel Montero, maybe Y. Molina.
Debatable, based on playing time, there are Ianetta, Ramos, Ruiz, maybe Russell Martin.
If Jaso fails to regain his 2010 form, he's still looking at above-average offensive production. The M's got themselves a hitting catcher, who fits the park. No doubts there.