It'd have to be a scenario of where EVERYTHING went wrong for team that was up 3-0.Idk if I can ever see a 0-3 comeback happening in the NBA. Human nature kicks in right, because the losing team is like damn even if we win one it's over anyway. Then the winning team is like we don't want to be shown up being the first ever team to lose a 3-0 deficit in the NBA Finals. The team that's up has too comfortable a lead to where even if they drop a game here, which the Celtics did last night, you think well we only need one more and they need 3 more. And the Celtics are just too good a team to lose another game, let alone 4 straight to this Mavs team.
The best chance of it ever possibly happening was last year with the Celtics and even then, they eventually ended up running out of gas at the end.