So there's a USTA rated 4.5 player who has speed, control, power on most of his shots. Good first serve, and a low bouncing second. He's practically there anytime any of us show up to play. He's good, I'll give him that. The only bad part of this story is that he makes the worst line calls. His partners usually forgot how to speak when he calls the lines wrong, and we're all just where we are--silent about his cheating. We obviously know he hooks us on line calls but we just put up with it somehow because he's still hooking us. What would you do realistically, with a real name and face to back it up?