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All of the evidence shows that when not injured Martin is completely fine with the bat, in fact even in 2015 before he got injured he was doing well.
I mean why is it any more of a question for Martin than it is for anyone... Cano, Cruz and seager could all come in and have an injury year or a down year, or battle a stomach virus for half the season or something...
As I said above I take the 90 OPS+ to be pretty much a given... the most likely outcome. I still give a good 10-15% role of the dice that he ages / lucks into a really outstanding season. 110 with the bat and stealing runs like crazy with his glove and legs...