Ajla Tomljanović vs America

[LP]

In my experience this is how people operate.  To be the GOAT its not solely about trophies its also about disposition, and for reference, I will point to the Roger Federer vs Novak Djokovic debate.  Nadal has become the currently undisputed GOAT but you don't need to guess whom would be the alternative sans Novak.

Across eras I'm not even sure Federer is the best, Bjorn Borg was pretty good, I can't see how it is possible at all to rate each opponent of any great player to establish a baseline, so the GOAT claim is naturally subjective.