From 2015-17 the Cubs played exceptionally well in Miller Park, going 19-10 there.
Thus it figured to be a good place for the Cubs to break out of the funk that had them shut out on consecutive days by teams (Reds, Marlins) that don’t figure to be that good by the end of the season.
That’s exactly what happened. The Cubs got solid pitching out of Jon Lester and the bullpen and the offense broke through in an 8-0 shutout win over the Brewers.
The Brewers obviously had a game plan that included running wild on Lester.