Cardinals losing at home to the Giants 8-2 after a five run SF eighth. If that holds, the Brewers division lead would increase to 3.5. Overall, the Cardinals are getting very little production from the bottom of their order right now, and they just demoted DeJong to AAA. Also, they're heavily reliant on soft-tossers in their rotation, including a 40 year old Adam Wainwright. Though they have some solid relievers (Helsley has been insane in the early going) and Arenado/Goldschmidt continue to be themselves, it's hard to see how they have the firepower to keep up with us throughout the course of the season.
Meanwhile, the Reds continue their recent offensive onslaught, besting the Pirates 8-2. As we saw this past week, they retain some quality hitters and are not nearly as historically bad as their early record would indicate.
As for the Cubs, who cares; they just plain suck.