Yes, his results were « poor » at that time, but if you look again at these matches in Canada and Cinci, he was playing better tennis than he is now. This summer, he manages to win because he serves better, returns better and moves faster. But his baseline game is, in my opinion, less convincing, with a lot of errors on the forehand side.
You can see he is neevous at the moment, he shows more emotions, more anger, and tennis wise, he his not dominating with his forehand and dropshots less, or with less quality. I think he is putting a lot of pressure on himself after the Wimbledon win and I think, if he meets Djokovic on Sunday, he will lose in straight sets which will affect again more his confidence, with the Djoker coming closer in terms of points, just before the US Open title defense.