There are most certainly dopers in the top 100 but to point out Soderling who have been medically proven to have mononucleosis and is also practicing as hard as his body allows him for a possible return to the tour...
Christophe is a known asshole though, nothing new about that.
"Certainly the most talented individual, the most well-rounded
... to play this game." - Jason Goodall
We should be appreciative of Federer though, because we will never see anything like him again. The fact he can still compete for slams ever after the erosion of his physical skills is really a greater testament to the natural talent he has than the period of time when he was dominating the tour.