Facing the giants
That's a worthy question Meade, as Dale already pointed out, the Giants have clinched the NL West, but who they will face in the first round of Playoff competition remains to be determined....
The Nationals have clinched a playoff birth, and will almost certainly win the division though they haven't achieved it mathematically yet....
They only need either one win in their remaining four game home-stand, (As of this writing, it's they're tied in a scoreless game in the top of the 2nd with the Phillies)
Or for Atlanta to take one defeat, (The Nat's have been on fire since August, but have cooled off in the past couple of weeks, posting a 5-5 record in their last 10 outings while the Braves have come on, going 8-2 and closing to within three games)
Four of the five teams that will be squaring off in the NL playoffs are so close in their records, (SF 93-66, Atl 93-66, DC, 96-63, Cinci 96-63) that the final four games of the season will be decisive in determining the playoff schedule.
We could easily have to go to some one game playoffs to determine the out comes, or other tie breakers. Here's how that would work:
Tiebreaker games will be played to determine Division Championships, even if the two tied Clubs are assured of participating in the Postseason. If a Division Championship tiebreaker game is necessary, the head-to-head record between the tied Clubs will determine home-field advantage. If the head-to-head record is tied, then division record will be the next tiebreaker.
If two Clubs are tied for both Wild Card berths, home-field advantage will be determined by the head-to-head record between the tied Clubs. If the head-to-head record is tied, then division record will be the next tiebreaker.
And of course there's still a spirited contest going on for the second wild card berth between Saint Louis, (86-73) and LA, (84-75)
So again to answer your question as to who will be facing the Giants, even with just four games left to be played, it's impossible to know....
Sorry I couldn't be more help....