If you call your incoherent or incredibly arbitrary ramblings 'schooling'; I'm glad I don't attend your school. Are you even tenured yet?
Here is my point, as I have tried to explain endlessly. When choosing which player's best is the best, going back in time and pouring over stats and records, or even score lines is nearly pointless.
Any player's best is actually a hypothetical. We have never seen any players' best. So what I am doing is taking individual aspects of each player’s game when playing well, that I have seen in matches, and comparing them to others. I also should mention I am assuming playing on a medium to fast hard-court surface (probably the most neutral of surfaces), not clay or grass.
I will state the aspects of the game that I am focusing on in their order of importance (again this is all my opinion, if you disagree so be it)
Movement/Defense:
Venus Williams in her prime is the fastest woman I have ever seen on a tennis court. Her movement was simply amazing at her peak and is the reason why so few players would hit many winners against her. What is also important here is that she could turn defense into offense so often. She would come up with devastating shots off of awkward positions and places on the court.
Steffi Graf was also a very good mover and perhaps had better foot work than Venus at her prime, but she was no where near as explosive.
Same can be said for Henin - awesome foot work just not as explosive
Serena in her prime did not move quite as fast or as well and had less reach.
I feel movement/defense is probably the most import aspect in the game and allows players that have it to do things others can not.
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Serve:
Venus Williams has the most consistently powerful 1st serve in women’s' tennis history. I know other women have hit it as hard or slightly harder once or twice, but Venus can hit serves above 125 mph several times in one game not just in one entire match. Her first is also one of the heaviest and has alot of work on it.
An inform Serena also has a big first serve, but not as big. She may hit more aces on average than Venus, but Venus has more service winners overall. Serena also places her serve a little better and has a more consistent second serve. However, if I am assuming these players are playing at their best then they will not be missing many first serves.
Graf had a good serve with very good placement but wasn't nearly as big. Same can be said for Navratilova.
Lindsay Davenport also had an effective serve, but again was not nearly as explosive.
Alicia Molik was also an excellent server and deserves to be mentioned in this category.
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Service Return:
Venus ranks among the best service returners in my mind. She is amongst the most aggressive at her best and gets her racket on more good serves than any other player. Infact with her great improvisation skills, she can be out of position and still get a great return in play.
Lindsay Davenport has a devastating return when she is on. She has probably hit more return winners than anyone. She takes it early and makes it penetrate beautifully. However she doesn't get her racket on as many returns as Venus.
Monica Seles is very similar to Davenport. One of the most aggressive returners in history with amazing angles coming off of her racquet. She probably hit the return earlier than anyone. But with 2 hands on both sides her reach was limited and would get aced way more than Venus.
Serena has a very good return when playing her best; penetrating and forceful. However, she has been handcuffed in the past with her grips on return. She is one of the few top players I have seen hit a two handed forehand on returns because she was too slow to change grips when necessary. She also does not have the reach of Venus on the return.
Graf's return is technically very good and consistent. However she can be exposed on her backhand return, often times slicing it in and not being as aggressive, ala Federer. This can be a weakness and allow the server, especially a big server, to get an early advantage in the point.
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Power of the Ground:
Venus Williams, at her best, is the most explosive women’s' player off the ground that I have ever seen. She has more pace than any other player off both sides, in particular off the backhand. I have heard Lindsay Davenport say this several times since she started commentating for Tennis Channel.
Lindsay Davenport hits the cleanest and heaviest ball in women’s tennis. She doesn't have the same pace as Venus but her balls in general have better direction.
Serena is somewhere in the middle between Venus and Lindsay. Heavier balls than Venus but not as much pace; and more pace than Lindsay but not as heavy.
Graf has probably the world class forehand. She hits it cleanly with very good pace and penetration. But her backhand can be a real weakness. She hardly ever came over her backhand and would continually slice. This can present an opening to other excellent players to take advantage.
Monica Seles was also very good off the ground with extreme angles and great pace. She took the ball very early and had very good accuracy and penetration. However Monica would sometimes get handcuffed on what was her forehand side and would not always hit it as cleanly.
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Mental Toughness:
Its here where Venus lags slightly behind the best of the best. She doesn't have the same drive of a Graf, Navratilova, Seles, or Serena. However, she does have great fortitude and loves to compete.
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Craftiness/Touch:
Venus lags way behind in this category. In my opinion touch and craftiness can quickly be overcome by power and explosiveness. Touch really only comes into play when an opponent is hanging in with her counterpart and has something extra craftiness in the bag to pull out thus unsettling the person across the net.
Graf had great craftiness, whether it was the amazing approach shots or drop volleys etc. Henin is also very good in this respect and maybe Hingis in her absolute prime.
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All that is to say: Venus Williams at her best is the best. Her sheer level of outrageous offensive combined with amazing defense is just too much for any other player playing at their best to handle. Period, point blank. That is my opinion. Feel free to disagree, but you or boredone are not changing my mind.