OK, so for whatever reason I'm not seeing any tiebreakers scheduled for that relegation situation in the PENT. Will have to investigate further what this means in the big scheme of things, but this could simply be yet another shortcoming of this type of save, which really does need to be looked at from top to bottom (sorry) by the devs and sorted out - it is a lot of fun but is more bug-riddled than an abandoned piece of fruit and fairly poorly thought out to boot. The quintessential "phoned-in" feature.
At least it still provides plenty of similarities to the IRL as Cubbies fans get their hearts broken and the Nats earn their first visit to the top tier.