Great fighter like Connors. He is the best rival for Federer.Best rivalry like Borg-Connors,sampras-Agassi,Laver-Rosewall,Mckenroe-Borg.The best player of clay court like best Sampras , the best player of Wimbledon who is much better than Federer not statistically but as tennis. When Sampras was playing wimbledon champions Boris becker, Mcken roe, Edberg, Stick,Goran Ivanasovic, Agassi,Patcash,Agassi were in circuit.He had to no1 Jim curier.Best grass court player like Richard Kricjek,Patrafter,Tim Martin and the giants like Paul rossi and Todd martin were playing.fastest servers like graig Ruseski,Mark Philopposis can kill anybody.French open cahmpions like Chang,Thomas Muster,Yugeney Kalfinokov,Sergie Brugera , never tired Ivan Lendl and Henri Leconte. No doubt sampras could not win French open against this best clay court players.Federer won when Nadal was not there.Hence by all means Sampras is the best ,Laver and Borg second and Federer and Nadal third Best.When Federer won wimbledon it was cakewalk for him because all these players retired.Nadal can beat Federer's record of 18grand slams if he is physically ok.Wish him all the best.
