It's helping my tennis between the point, not when I'm...

It's helping my tennis between the point, not when I'm running and hitting the ball. It's between the point that I have 20 seconds, I control my breathing, like in and out. A lot of time if you don't play well, is because you're getting nervous and you can't control. Your heart is pumping sometimes really quick. Meditation is helping me that I can control my breaths, I can just relax and ready for next point.