If you're the Mets, you probably want to win the first game, so Atlanta is forced to use Chris Sale in Game #2 and not in the WC series.
Otherwise, if Atlanta wins Game #1, I'm sure Jesse Chavez will likely get the start and eat a bunch of innings haha.
Also, both teams are huge division rivals, so knocking one out of the Postseason is something I think either team would look forward to. Yes the team that wins Game #1 will most likely cover innings with other arms they don't plan on using in the WC matchup for Game #2, but they're not going to wave the white flag. Both games should still be competitive.