Mention of Rosewall leads me to consider Rosewall's own personal ranking of the world's greatest ever tennis players in an interview he gave to an Italian magazine in 2010.
Rosewall played against these players, apart from Federer, hundreds of times.
Gonzales himself, in an interview in 1995, rated Hoad's game as the best ever.
Laver has not committed himself to a ranking, but in early 1963 he was skunked 13-0 in a head to head tour by Hoad.
Rosewall is such a rat, he put Laver so down. Guess when he was getting his ass handed over to him everytime he must have carried a grudge. I knew he was not so simple after all. Laver had a better H2H against that RoseMug.