As a kid I loved John McEnroe. They called me Mac because, while everyone else liked Borg, I was crazy about McEnroe. I tried wearing headbands and sweatbands, and whooping at people. It didn't quite work.
I feel it's the conscious mind that messes things up. The conscious mind is constantly telling you, this might happen or that might happen, even before it has happened. Your conscious mind tells you the next ball might be a out-swinger, but when it's coming at you you realize it's an in-swinger... so literally, you've played two balls.
I never played with a runner in my entire life, even in schools, because only I know where the ball is going and how hard, when I hit the ball, something my runner will never know about.