Should Sweden win by fewer than 6 goals, the US will grab the top overall seed (this also happens if the game goes to OT). This is very important because Canada and Russia will be on the same side of the bracket, the winner of which will play the 2 seed in the medal round. Also, the 1 seed gets the winner of Switzerland-Belarus, as opposed to Slovakia-Norway (i.e. Slovakia).
EDIT: Clarification-if Finland wins without OT, Finland gets the top seed and the US gets the 2 seed. As Canada is the 6 seed and Russia is the 3 seed, we really do not want to be in that bracket.