tenisdecente
Hall of Fame
He had that run at the US Open where he changed his serve and was serving much bigger. There was a Sky Pad interview with Rafa post a WTF match where he says that he only served fast at the US Open for that one run and that he purposely has slowed down his serve for his game though I suspect the real reason was maybe an injury. Perhaps you can view Sky Pad interviews in europe, I can't in the states with one of the ones with Barry Cowan
Also here's a clip Rafa trying to change his serve.
I remember that, he was serving really big in that USO, flat and around 130mph. But what I meant is a solid improvement, meaning that he keeps a good serve for the rest of his career, like the improvement in his net abilities (his smash is GOAT BTW). He had seasons when his serve was really top 100 material. I am not sure if he can improve from now on, but who knows, if a guy can do something like that it is him