I honestly don't remember where I stole this idea from. It's so simple, anyone could have come up with it. I do recall that I have been using it for years.
Recall the blog post about Faisal Hassan's mental buzzwords? Take it one step further and create some visual cues from your favorites. Journal, index cards, post-it notes, on your bag tag, get a Sharpie and write them on your arm, anything handy will do. Keep them somewhere you can access them easily during the match. I have mine taped to my racquet. I see them every time I adjust my grip, which is often. When I first started using this, I was having trouble staying calm and needed to settle down. It has really helped my mental game. Now I have a new boomstick and a couple of new but equally inspiring messages to ponder while I am on court.
What's on your racquet??