Before this one even gets going, though, there's business to handle. Atlanta plays Washington on the road and Philadelphia hosts Arizona, and then the two sides open this very series a day earlier — so whatever storyline exists by Saturday will already have a game's worth of new information baked into it.
Atlanta's season-long shape is still the story that matters most: a division lead built despite losing Spencer Strider and Spencer Schwellenbach for the year, plus Jurickson Profar's suspension eating into the outfield mix all season. That's a lot of attrition to survive and still be up in the standings. Philadelphia's counter is a lineup and rotation that have simply played their best baseball of the year lately, capped by a 7-1 rout of Arizona, without needing a single moment of magic to get there.
Put those two pictures side by side and it's a division race that's tightened without either team doing anything wrong — Atlanta has just absorbed more bad injury luck than Philadelphia has, and Philadelphia has simply won more baseball games recently. That's the whole tension of this series before a single pitch of it is thrown.