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Ruben Sierra's career flatlined because of a combination of poorly administered steroids that collapsed his stroke and illicit drug use. Is Bill Hall enjoying the wrong kind of Coke after games and shooting up horse steroids? I kind of doubt it.
Cesar Cedeno did have two huge years very early in his career before the league adjusted to his approach, but from age 23 to age 34...he was essentially the same hitter right on down the line in terms of OPS+.