boogieman
It don't mean a thing if it ain't got that ping.
Amen! Put a quick W or two on your side and watch them sweat!If I knew somebody was going to stay with me a set amount of time like a tournament set I tried to crush them like a grape the first game or two. A few other tricks I am sure you are familiar with but they were all about intimidation. I liked to see that look in their eyes and on their face that they knew they had stepped off in it, even if it wasn't always true!
Kinda works with another maxim of mine that I often applied working, "If you can't confound them with wisdom, baffle'm with bullshit!"
Hu
Never let em see ya sweat! Especially in competition. Show no self judgement on made or missed shots. Just keep your pace and go on to the next shot or to your seat. On a bad result just think "well, they run out this round or I do next." Go sit down and relax. If you get back finish the rack. Don't let them get a read on you, keeps them off balance and thinking the pressure is on them.
Negative talk is self sharking. Don't put blood in the water and wonder how you got devoured!

The truth is, you may be playing terrible but if you give them no read it leaves them wondering wtf is going on. Did you just set a trap? They will think about stuff... like did he leave me a scratch shot? Sure enough if they imagine it, they do it.
It doesn't work on all players but many pool players imagine nightmares that don't even exist other than in between their ears. Having no "tell" or giving them nothing to read makes most people at least slightly uncomfortable. That uncomfortable feeling is ripe ground for their head to run wild.