I agree, that is another reason I think Serena might have had more trouble with Navratilova than with Graf. She doesnt even play a lot of good lefties, but I seem to recall one from France (dont know her name first hand) who does pretty well vs Serena, and she doesnt even serve and volley or come in a lot, have a true hook or kick lefty serve into the ad side (I may not remember her name but have seen her play numerous times), and of course isnt even close to the caliber of player Navratilova is. Even more in the earlier 2000s when the courts were a lot faster still than they are today.