This is something I've been thinking about discussing for quite a while, and hopefully others here will share their opinions. Think about the game, and how some players execute shots that are both technically and in form nearly identical with another player, irrespective of era. I'll begin with Steffi Graf's and Ivan Lendl's backhand drop shot. They both used this surprise tactic very well, as their opponents were expecting pace and depth (even from their backhand slice drives), and both players' take-backs are nearly identical, and the stroke itself is hit as though a slice were coming, and the simply shortened up the beginning of the follow-through, dropping a ball just over the net with a low trajectory (which takes incredible timing). It's an amazing shot from two power baseliners. Anyone else?