The NBA champion Boston Celtics are in unfamiliar territory, heading to New York down 2-0 after surrendering 20-point leads to the Knicks in each of their first two Eastern Conference semi-final series games.

The New York Knicks fought back from a 20-point third-quarter deficit for the second straight game against the Boston Celtics to open up a 2-0 series lead in the Eastern Conference semifinals.

Not only do the Celtics need to climb out of a 2-0 series deficit, but there's more recent history that they need to overcome.