So, to the original question, I do believe that some, if not most, tennis players dope. I want to believe that the heroes of tennis world don't, but that may be wrong.
I don't see Federer as a doper, or Rafa. I may very well be wrong, but that's what I believe
I don't think Novak is, but his last couple of seasons have me second-guessing
Maybe I'm stupid to believe in purity in some sports, but, IMO, tennis is too much mental. it's about what's between the ears, not how physically gifted you are.
At least, that's what I believe