As cliche as it sounds, you just take it one game at a time. If Verlander goes out and shuts down the Rangers and it moves to 3-2. Now you're just saying that you have to win 2 in a row, then so on. Unlikely, but still a chance considering the Tigers had a chance to win every game so far.
Well I'm just sayin. I still remember 07 when the Indians were up 3-1, Josh Beckett shut down the Tribe, and Boston ran away with the series. Doesn't take much to change momentum.