Originally Posted by beast of mallorca
Wait til their careers are over then, before making your final judgement.
If he can break Roger's slam count, weeks at #1, WTF, and piled up countless of tennis records then he should be put ahead of Federer. As of now, Roger is widely considered as the greatest(same for Graf).
Tier1(goat): Federer; Tier 1.5: Laver, Gonzales, Sampras, Nadal, Borg;
Tier 2: Lendl, Connors, Rosewall, Tilden; Tier 2.5: McEnroe, Agassi