Graf Tauziat is the most impressive one in history, mostly because Nat was a GREAT player, and she had evrything to make matches way more difficult than Graf made it look.
Zina met Martina 24 times of these 33 matches in fast courts, and was quite useless. look at the other meetings and watch how the younger player was able to cause her damage.
Sadly, Nat never had a chance to play Graf on Grass.
also, it should be noted that Tauziat was at her best after 30, as we all know. zina was pretty much solid her complete career, although 1990 wimbeldon was wow wow wow.