If we win today and Cle loses:

NYY 95-66
Bos 94-67
Cle 93-68

In this scenario Cle would no longer be able to tie us so:

If we lose tomorrow & Cle wins:

NYY 95-67
Bos 95-67
Cle 94-68

We'd be tied w/ Bos and they don't have 1 game playoffs for division tiebreakers and the 1st tiebreaker is head to head, w/ 1 win we win our 10th and the season series so we'd win the division.

If we win the next 2 days and Cle splits then:

NYY 96-66
Bos 94-68
Cle 94-68

There would be a 1 game playoff btw Bos & Cle.