Brother, there isn't a list of greats exists even in the Roy Emerson household that has Roy on it ahead of Lew. Lew Hoad is prolly top ten, if these things can be measured. People who watched tennis at the time saw him as greater than Laver and Gonzales. He had injury problems, etc, but the guy is definitely top notch. I realise his activities were more beyond the scope of the system you're using, but we have to bear in mind that players priorities were different then. The pro game wasn't a huge money spinner like it is now. The best judge of how great Hoad was is to listen to those who played against and with him.
Even scoping his wiki page I see an
article written by the esteemed Frew McMillan as late as 2001:
The finest player of all time? Possibly. At his best certainly the greatest of the greats that I have seen. Light on his feet yet with the punching power of a fierce fighter. I could marvel at Rod Laver and McEnroe, their flair and artistic strength, but Hoad's ruthless efficiency would take my breath away.
Kieran, again, you're emphasizing peak form over career performance. Hoad was, no doubt, truly amazing for a period of time. And I get that his contemporaries say that he was as good, if not greater, than anyone else. But in the end, he was plagued with back injuries, and his career paled in comparsion to his contemporaries Rosewall and Laver and predecessor Gonzales. And consider that even at his peak, he was 0-5 vs. Rosewall in Pro Slam finals and 1-2 against Gonzales.
So despite what people say, Hoad's career doesn't match up with other greats. He could be the all-time "what could have been" player, but in the end his career is what it was.
On the other hand, perhaps I should re-name this list "Top 30 Tennis Careers Ever" because that is closer to what it is. Greatest player implies how good a player was at his very best, and that's a much harder--and more subjective--thing to assess.
By the way, here are Rod Laver's top 10 players, past and present. I believe he did this a couple years ago.
PAST
1. Lew Hoad
2. Jack Kramer
3. Pancho Gonzales
4. Don Budge
5. Fred Perry
6. Ken Rosewall
7. Ellsworth Vines
8. Bobby Riggs
9. Jack Crawford
10. John Newcombe
Evidently no love for Bill Tilden, or maybe he was just too far before Laver's time. I assume Laver would rank himself ahead of Hoad!
PRESENT
1. Roger Federer
2. Bjorn Borg
3. Pete Sampras
4. John McEnroe
5. Rafael Nadal
6. Novak Djokovic
7. Andre Agassi
8. Jimmy Connors
9. Ivan Lendl
10. Stefan Edberg
I believe this list was compiled in 2012, because it mentions Novak having won 10 titles the year before, which was 2011.