In tennis your biggest challenge isn't the opponent that is standing on the other side of the net. It's the pounding of your heart in your chest, the aching of your lungs, the weakness in your legs and the little voice inside you that says, "I can't." But you don't listen to the nonsense, you work harder. As that voice starts to fade away, you hear another faint whisper of a voice starting to say, "I can." That's when you realize the person you thought you were is no match for the person you really are. That's dominating tennis. Learning to play tennis at a high level is easier than you...