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Merks, Ackley has ALWAYS been a terrible leadoff hitter in the bigs. His rookie year he was, however, a nice hitter in the 3rd slot. Past performance suggests batting leadoff is not the place for him. His improvement suggests he may now fit there. In his heart, I think he sees himself as a guy who will punish you, not just chip away at you. He was the best college hitter in the game, if you will remember correctly.
My only concern about batting him 1st is that we not try to turn him into a pure opposite field hitter.