Ajla Tomljanović vs America

[PaulP]

Spot on Pauly. Lots of factors across eras. racket technology, ball technology, sports science, strength and conditioning technology, diet/hydration. The list goes on.

Yep. I should also add, that if you do a google search for a Williams v Court comparison, all the "experts" (tennis journalists, ex players etc.) that I have found give the nod to Serena, usually prefacing their articles / statements with the caveat that such comparisons are a little suss.