Same reason LSU beat them in Tuscaloosa and couldn't do it in New Orleans. As others have pointed out, Saban doesn't lose revenge games.
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Mississippi State PFF Grades from 41-9 loss to Auburn
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Lopsided analytics illustrate Mississippi State's collapse against Auburn
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"Not good enough": Jeff Lebby answers questions of performance and job security following blowout loss to Auburn
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Rapid Recap: Auburn 41-9 Mississippi State
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Last Call Predictions for Mississippi State vs. Auburn