His serve was bad yesterday. One of the reasons it was such a lackluster performance.
When Roger plays at his best, or even as he did in the US Open final, there is no-one who can stop him. I think most people would agree with that. The problem is that he isn't reaching that level as often as he used to. A lot of it is down to mental problems. The fact that Rafa is just too good for him on clay is a factor. Rafa goes on a clay-court winning streak against him, and he starts to lose confidence and doubt himself. This doubt is carried into all matches, and it affects the way he plays. Against most players, he is still too good, but against Nadal and Murray, this simply isn't good enough, as they are both great players, and the fact that they are bad match-ups only adds to his mental problems. It seems to me that he is forgetting that he is the greatest player of this generation, and in many people's opnions, the GOAT.
I don't necessarily think the head-to-head records will hurt him in his claim to become the GOAT, but I think his play over the last 9 months could. Ever since the Wimbledon final, tennis has skyrocketed in popularity, and if all most people have seen of Roger is the tentative, error-making version, then their ignorance could harm his claim.