NEW YORK — If you did the math, the Yankees ’ magic number to clinch a playoff berth was three heading into their final six games.

It’s really one leading into Tuesday night’s series opener against the White Sox.

Win and they’re win.

How so?

It’s complicated, but it comes down to this:

If the Yankees win on Tuesday night, they’re guaranteed to finish with a better record than either the Red Sox or the AL Central runner-up — the Tigers or Guardians — because of head-to-heads in the final week.

The Tigers and playing three games in Cleveland beginning Tuesday, then finish the regular season this weekend in Boston.

Heading into Tuesday, the Yankees (85-68) held the first wild-card spot while owning a three-game lead over the Red Sox (85-71) and two-game edge over the Guardians (84-7

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