The pros
I’ve given points to 29 tournaments (opposed to the 17 tournaments chosen for the “official pro ranking”). In 1964 the biggest events were the US Pro, the French Pro and Wembley which I’ve weighed by 2. Then the US Pro Indoor Chps (weight=1.5) and finally the 25 other tournaments (weight=1). Points granted according to the fields as in 1963. Once again this is rough because I haven’t given points to tour matches but that year there weren’t many of them except the New Zealand tour, the Trofeo Facis tour and the Johannesburg- Ellis Park Challenge Match labelled (exaggeratedly) as “World Pro Championship”.
Here is my old pro point system ranking (not updated since 2007) : 1 Rosewall 116.5, 2 Laver 116.125, 3 Gonzales 74.5, 4 Gimeno 44, 5 Hoad 30.25, 6 Buchholz 28.625, 7 Olmedo 21.25, 8 Sedgman 16.5. As you can see Rosewall and Laver are so close in that tournament ranking that I can’t certainly claim that Rosewall was better than Laver from that ranking because a) the margin of error is superior to the points difference between both players : 0.375 ( = 116.5 - 116.125) and b) point systems are arbitrary. So I just can say that they were quite equal in tournaments but because Laver was clearly superior to Rosewall a) in tour matches (which I repeat I didn't take into account in my point system ranking) and b) in head-to-head meetings (Laver beat Rosewall 15 times out of 19 (AndrewTas’s statistics))
I give Rocket the edge.
Another argument in favour of Laver : his 1964 record was 81 wins and 27 losses (including the tour matches) whereas Rosewall’s was “only” 69-30.
So apparently there is no doubt about the top pro.
The amateurs
Now let’s talk about the amateurs : Emerson had his best results ever with no bad loss in the greatest events (the only year he managed to do this). His only loss was at Roland Garros to Pietrangeli a player able to beat any amateur (and perhaps pro) on clay. Then followed in my opinion, Stolle, Santana, McKinley, Osuna, Cliff Drysdale, Ralston, Darmon, Pietrangeli and Lundquist.
Comparisons between pros and amateurs
Now I compare the pros and the amateurs. Between 1962 and 1964 Laver had very very probably enlarged the gap which separated him from Emerson. In 1964 Rosewall, being so close to Laver, was therefore superior to Emerson without almost any doubt. For once in the 1960s Gonzales played throughout the year (except the South African tour) so I can’t downgrade him (as I do for 1966 or 1967). In 1964 Gonzales was very close to the top : he won the 4th greatest event (US Pro indoor) and was very good in the 3 others : in particular at the French he would possibly have beaten Kenny (if I believe “Tennis de France” report) hadn’t he been injured. In head-to-head meetings he led Laver 8 to 5 and trailed Rosewall 3-11 (but for once Rosewall had the advantage because many of his matches against Pancho were played on clay). So Gonzales is the 3rd pro very likely ahead of amateur Emerson.
Here comes Gimeno’s case : in 1964 he wasn’t so impressive and was far behind the pro trio for me (30.5 points below Gonzales in my tournament ranking) : at the US Pro (3rd) and the French Pro (4th) he confirmed his “normal” level but at Wembley (against the old Sedgman) and in the US Pro Indoors (against MacKay) he suffered two bad losses unworthy of his rank. Nevertheless Gimeno won 3 tournaments (College Park, Noordwijk aan Zee and the Bavarian Pro) and except against Laver and Rosewall none of his head-to-head win-loss records were negative.
Hoad who followed Gimeno in my pro ranking was simply declining : he didn’t win any tournament in 1964 (Zurich in September 1962 was his last ever tournament win if I except some minor obscure tournament in the open era) and he had negative win-loss records against Laver, Rosewall, Gimeno, Gonzales and even Ayala. His best 1964 performance in the great events was his 4th place at the US Pro Indoor Chps.
Because on one hand Gimeno wasn’t very good and Hoad was over the hill and on the other hand Emerson was at his very best with no bad loss I suggest that Emmo was possibly as good as Gimeno in 1964 (I think that if we consider their entire careers Gimeno was slightly better than Emerson most of the years).
My 1964 ranking :
1 Laver,
2 Rosewall,
3 Gonzales,
4 Gimeno
& Emerson,
6 Hoad
(Stolle was too far behind Emerson for being considered as in the same league as the 5 leading pros).