Let's say Federer would've been less successful on clay. He'd get consistently to semifinals, but had no clay masters and zero French Open Finals. He would have 16 majors instead of 17, but all other records in tact. However now his head to head over Rafa was in his favor by a couple matches because they will shockingly have never played a match on clay.. but he has no career grand slam, less masters shields, less finals, never more than 3 consecutive finals Soderling would've won the 2009 French Open. Had this hypothetical been true would Federer be: 1) Same GOAT candidate in the eyes of the people on this board.. no difference. 2) Greater GOAT candidate since he'd have a positive H2H with Rafa (although would still have the 2009 AO loss and 2008 Wimbledon loss on his resume) 3) Lesser GOAT candidate due to being basically a Sampras+ More majors, better clay resume, but still no real success on the surface.