Okay here is an interesting hypothetical say we take Ivan Lendl and put him in either the 90s or current era and replace him with the current GOAT candidates (Sampras and Fed, please no Nadal flame wars you will notice Nadal's career will not work in line with this.) So say he hits his peak in 92 or in 2002 does he win more than 8 slams or less than 8 slams, now mind you Sampras and Federer are not in the question Lendl is basically taking their place..does he win more? Note the surface change might be a huge factor as the Austrailan Open is now going to be hardcourts. Big servers also come in to play from the 90s on etc. Opinions anyone? Working on mine right now.