I think it is difficult or impossible to compare players across eras. The best you can say is someone was the “best of their era.” Equipment has changed dramatically, so has nutrition, conditioning and the surfaces used in tournaments. Jimmy Connors is the only player to win the US Open on all three surfaces, but I don’t think anyone would throw him into the mix. I’m partial to Laver, and he was the best of his era, but so is Federer...
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I’m witchoo. You have to compare them to others in their generation. Anything else is simply amusing speculation. Laver was great in his day, and Borg in his.
Agree. Each era has it’s greatest. Getting a GOAT (greatest of all time) is possible, but would be open to too much subjective ‘noise,’ bias and speculation.