I find sometimes funny remarks makes is a little easier in confronting cheaters. If the line calls are pretty bad and I have asked if they are sure repeatedly, I will call one out and say, oh wait sorry that was in I just couldn't get to it and laugh. I have even on the change over said, my bad with that call just wanted it to be out and smile.
Some people cheat, not just to win, but to get into your head. I don't generally game people, but if they start it why not give it back?
'Tennis players have fewer faults'