Simon: Four contending teams with cause for concern on defense

From SABR member Mark Simon at The Athletic on September 6, 2018:

A great defensive play or​ game​ can carry a team​ a long way​ come this time​ of​ the​​ season. But just as much, a bad play or game can do a significant amount of damage to their postseason plans.

Here are four contending teams that still have something to worry about on the defensive end as we head toward the playoffs.

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Originally published: September 7, 2018. Last Updated: September 7, 2018.