Very interesting thread! Thanks KK and FiveO. This breakdown makes sense and is very understandable.
I always viewed Sampras as an all-court player, but he certainly had preferred styles and seldom found a need to depart from them. Whereas Federer is the model all-court player.
I think you can make a case for a sub-category of the heavy-topspin baseliner (like Bjorn Borg was). Simply because of the way it wins. It is agressive and breaks down the other guy's game because he can't get his shots to roll over for him. Result -- Out, long...a lot. Also, when that starts happening, the heavy topspin artist can attack the net very easily. So this style of aggressive basline play is different than other aggressive baseline play. Frankly, I wonder why we don't see it used anymore. Any thoughts on that?