If the Mets are to storm back into the postseason picture, the way they did against admittedly shorter odds in 2015 and ’16, they need to be something close to perfect down the stretch. Lately, they have been anything but, undermining themselves with mistake after mistake after defensive mistake. Officially, the Mets committed three errors in their 5-0 loss to the Cardinals on Tuesday night. Unofficially, they made a handful of other miscues, their sum total keeping victory well out of reach.

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