The Celtics will have to make the NBA’s 14th comeback from a 3-1 deficit and may have to do it without Tatum, who was carried off the court with a right leg injury with 2:58 left.

As he crumbled to the floor writhing in pain, it was obvious this one was serious.

For Lillard — and now possibly Tatum, depending on what the MRI and other exams show — injuries could be part of the story next season as well.

The absence of Tatum is a massive blow to Boston.