Two notable scenarios (out of 64 major variations and 1,536 actual different outcomes)
What would render Monday’s doubleheader completely unnecessary?
There are a couple scenarios in which the National League playoff field is set and seeded by Sunday night. This would require:
• A Royals sweep of the Braves
• The Padres to take two of three from the Diamondbacks
• The Mets to win the series over the Brewers
In these cases, the Padres would host the Mets and the Brewers would host the Diamondbacks. The Braves would be eliminated.
And also, if either Atlanta or Arizona is eliminated before Monday (the Mets can't be) it's possible the commissioner would cancel the games and determine the 5th and 6th seeds some other way.