Unfortunately, players spend so much time working on technique that their entire knowledge base is associated to technique, which means their analysis tools are also linked to technique. When players try to figure out what went wrong ,or right for that matter, they typically resort to their knowledge base for answers, which is the last place they sould look, when trying to develop concentration skills. Just like hitting a serve or forehand, which are made up of a series of basic movements to obtain an objective, concentration and percentage tennis can be looked at the same way...a series of thoughts or strategic ideas that allow you to focus on your objective. What I see way too often is that if you ask someone, how to hit a forehand, backhand, volley, serve or any other shot, they can describe it in accurate detail, therefore they can replicate it with confidence. Contrast this to the response you get when you ask someone to "describe how to play percentage tennis, or how to concentrate." You'll be surprise how vague tor confusing the response might sound. I'll bet this leads more to nerves than anything. Agreed that nerves might become an issue if you're hitting the ball ok, but loosing and you can't figure out why. If the answer lies in blaming your technique, then that's pressure, because now you're more likely to try to hit the ball harder, deeper or better, which means you're legislating quality. You've now marked the beginning of the end. Now, instead of blaming technique (resorting to looking for answers in the knowledge base you amassed because of all the lessons or drilling you've done) you can make one, two or maybe three strategic changes, which don't necessarily put pressure on your strokes, where's the pressure/nerves?

I believe the answer lies in understanding basic percentage tennis (the basic building block for every decision you make when playing), which leads to increased concentration and less nerves. Do you have a good understanding of percentage tennis?