The Yankees and the Mets have spectacularly headed in opposite directions since they met for two games at Citi Field late last month.

The Mets (79-44) swept their crosstown rivals in that series to kick off a 20-7 run, culminating in Sunday’s wild, 10-9 comeback victory in Philadelphia.

Beginning with those two losses to the Mets, meanwhile, the Yankees (74-48) have dropped 17 of 25, including Sunday’s 4-2 win to avoid a four-game sweep by the Blue Jays.

Weather permitting (there’s rain in the forecast), the first-place locals will clash for another pair of interleague games beginning Monday night at the Stadium. Here are the most marked changes among the two teams since they last met and what to watch for this week: