The Yankees slipped to one loss away from disaster — and we’re talking about Aaron Boone again

At its root, Tuesday night came down to 15 pitches.

It came down to the 15 extra that Red Sox manager Alex Cora let Garrett Crochet throw in a 117-pitch outing and the 15 that Max Fried (102) didn’t.

It came down to the 15 that Luke Weaver tossed instead — and the two runs he allowed — after Yankees manager Aaron Boone turned to his bullpen in the seventh inning.

There are plenty of other variables and layers to the gut-wrenching 3-1 loss in Game 1 of the wild-card series Tuesday night in The Bronx that put the Yankees on the brink of elimination.