P.S.G. Outclasses United, at Last Blending Grit With Its Goals

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MANCHESTER, England — That sinking feeling, that sense that it was all happening again to Paris St.-Germain, might have set in a couple of weeks ago, when Neymar limped off a field in Strasbourg, his face crumpled with tears, the fifth metatarsal in his right foot broken.

Or it might not have come until a little later, until last weekend, until the point when Edinson Cavani, wincing from the pain in his hip, was told he would not be able to return to the field at the Parc des Princes for the second half of a Ligue 1 game against Bordeaux.

Or maybe it was not the injuries, but the composite effect of them: Maybe it was the slow drift in P.S.G.’s…