I've said before Chris Evert is the most mentally tough athlete ever to live. I'm really not exaggerating. Her opponents were terrified of her, not terrified that they would lose, that was a a given, but that they would get beat 6-0 6-0 in humiliating fashion. I'm quite sure has done that more times than anyone in history.
Also how many grains of salt do we have swallow over M. Court's majors record before her 11 Aussie singles and 12 Aussie double are correctly discounted. Any Aussie Opens before the mid '80's had vastly inferior fields to the rest of the majors. She was a great and dominant player but her majors numbers are inflated.
I got Martina as #1. Even with some crunching of her numbers (if that's even possible) she's still clearly dominant.