Everybody knows if Tiger gets 18+1 majors he is without question the greatest golfer of all time. NO DOUBT! This is because of the insanely difficult and high target of 18 majors+ a career slam and long time at number 1. So, tennis, if someone can win 15-16 slams plus a career slam have a long period at 1 and healthly H2H against major rivals..surely that's enough to confirm a greatest player of all time. Roger has a chance to achieve this..if he doesn't, then Nadal sure does!! I'm sure if you asked Laver if this was enough..he would say 'YES'...he already thinks Roger is the best player he has seen.