To say that pele is even close to Maradona is a disgrace to Football, if you seen any videos of football of pele you would know that he wouldn't have a chance against 80's 90's or 00's defenses. Even Messi or Ronaldo are way better players than Pele. Not to mention that pele played with players ad good as him in the brazilian national team.
As far as Maradona doping it never happened to take advantage, actually he used cocaine and if anything it undermined his game. In 94 what happened is that he was under a diet and took vitamins and stuff like that, when his personal trainer was in the USA went to a pharmacy and bought a vitamin supplement that was endorsed by the NBA, and he thought that it was therefore permitted to use by the FIFA but it happen to have ephedrine which is forbidden by fifa. After that the AFA forbid the players to have their own personal trainers without supervision. He never said that he or anyone else doped. What he said many times is that many players used to go to parties and did cocaine, but nothing to improve their game.
You can go anywere in the world and say Maradona, Messi or probably Ronaldo (even Pele) and people would know how they are, say federer and many wont know. Tennis is not as popular in the world as football.
Anyways there is no doubt that right now Federer is in the at least top 20 "athletes" of all time.