1) Colby Lewis must hold onto his ALCS form.
2) The bullpen must get a hold of themselves.
3) Cliff Lee must recover and become THE UNBEATABLE ONE again.
4) The Rangers need to solve Matt Cain in Game 6.
That last one is the hardest, obviously, but even so, if they win these next three, they will have Colby Lewis back for game 7, which means that #1 may be most important.
On the other hand, that doesn't assure a Rangers' WS title. If Jonathan Sanchez doesn't do what he did in the final game of the NLCS, and matches Colby Lewis, the Giants will have the advantage, because the Rangers don't have anyone who can match up to Matt Cain anymore, with C.J. Wilson out.
The Giants took the advantage last night, but they still have to watch out for the Rangers as the World Series visits Arlington for the first time.