I have this issue. Titleholders was last week for our TAP league. I placed a lot of importance on the tournament in my own mind and practiced my ass off for 4 weeks to get ready. I was running drills and playing the best players around as often as I could.
As a result of the drills and the practice I moved up to a 6 in my league and was shooting the best pool of my life. I was handily beating people that I often had trouble with and really excited about the tournament and ready to take no prisoners. Anyway, I showed up and laid a big fat egg. The team did really well, we finished 3rd place with a lot of big wins.
My problem, From the minute the team arrived my pool game disappeared. I could not run a pattern, I was missing routine positions, I was even missing gimmes...which never happens. The knowledge was still there but the execution was completely gone, it's literally like someone turned off a switch and my game disappeared...weirdest thing I have ever experienced.
Anyway we won every set that I lost a match in, so the team had my back, I even coached several of my teammates to victories (knowledge was still there).
So I thought maybe it was the pressure...so I went for four hours yesterday to play on some 8 footers (played on 7 footers in the tournament)...same issue, barely had a four ball run all day.
Any of you ever had this happen??? Any suggestions for remedy as there is another titleholders in a week that is our last chance for Vegas this year.
I'm going to chime in here because I've been in these shoes and you can beat this if you really want to.
There's been some good advice in this thread and some not so good. But let me back up...
I'm the most nervous player you will ever meet! I thought I had a normal level of nervousness until I started talking to other decent players and I now realize that I'm off the charts. To be honest, I've even realized now -- through conversations with my wife that I even have an unhealthy level of anxiety in my everyday life. I guess I've lived with it for so long that I thought it was normal. When it comes to tournament play for me, if I got any more nervous/anxious I would probably get close to experiencing a panic attack. So it's pretty bad...
BUT
I've figured out how to deal with it. Here's my recipe.
1. Don't do any pretending. Don't picture the audience naked. Don't act like it doesn't matter. Don't picture yourself all alone in your basement playing. Instead -- embrace the nervousness. It might feel like you're falling off a weekend long cliff but at least you know you're living. The nervousness can be used to play your best pool so you really don't want to eliminate all of it.
2. Exercise and Breathing. In between racks stretch out. Go for a fast walk to the bathroom. Jump up and down. Do whatever you can do without having everybody in the facility think you're a mad man. Do this to burn off some of that nervous energy. Then focus on your breathing trying to calm down your heart rate.
3. Have realistic expectations. YOU ARE GOING TO MISS! When you do try not to let it defeat you. Learn from the mistake you made and move on.
4. PSR. This is vitally important to work on DURING your practice time before the tournament but when it comes time to play you really shouldn't be talking through your PSR every shot. Instead just focus on the most simple thing like staying absolutely still. Or have one single thought that you focus on. Think "statue" or "smooth" or some other single thought.
This really has worked for me so I felt I would share. This past weekend I played the best pool of my life and I'm hoping I finally have it figured out. I played some great pool against some National Champions and managed to win the Grand Rapids Open so these steps aren't just theories for me but I've applied them successfully in events.
Good luck.
***Edit***
Maybe you weren't even specifically talking about nerves here but I think others were.