SAmpras used a prostaff 85 saint vincent build. this is a very low power heavy frame. The weight that the frame has, about 14 ounces customized, and where it is located, much of it on teh head, give it enough power. The formula for momentum, which is what you want to give to the ball, is P=MV. This means that the faster the velocity of teh frame is, and the hea vier it is, the greter momentum it will have. If you gave sampras roddicks racquet, it would be easier to swing his frame, a 11 ounce stock setup, but he would have to swing it much faster in order to achive teh speed he gets with his own frame. The other way around, roddick would probobly miss**t much more, becasu the head is 15 inches smaller. If agassi woul hit with sampras frame, he would probly wiff quite a few times. theres a 22 inch differnece in their frames. also a 13 million$ difference in career earnings, but tahst beside the point. on another side note, doccik's vollies wouldnt suck quite as much, because he woul have a heavier more solid frame to use at net. His serve would be less powerful in my opinion, and i better be right aobut this, because looking to be a physics major. lol. SAmpras on the other hand, would probly get a bit more juice on his serve, but the control would be taken away, becasue the weight would be less concentrated on the head, where the ball makes contact. the location where mass must be, is the location where the rotation in either the of teh x y or z axises originates from. Sampras has teh better stick and thus proves that he is a ebtter player because he can handle that beast. if anyone here wants to try his frame, buy an oold regular tiwanesse pro staff 85 adn but 5 strips of 1/4th inch lead tape 6 inches long per strip at 3 and 9 oklock. then try to hit with it. let me know how much ice you use on your elbow after the first 3 swings.