I played a guy today who cheated in a way I've never seen before -- after I won a crucial point, he claimed that he had called a ball out 10 shots before my winner, and after that he just hit the ball over the net because I kept doing the same. Unfortunately I didn't process what he was saying quickly enough; if I had, then I would have said I called his ball out 11 shots before my winner, so the point was mine regardless! But I was wondering: is there any USTA rule that can be applied against an opponent who cheats in this manner? Or do you always have the option, after losing a point, to claim that your opponent's first shot of the point was out, and after calling that ball out you continued hitting the ball over the net for the next several shots just for fun? Of course you won't make friends this way, but is it a way of cheating that can always be used to steal you one point you don't deserve?