Professional tennis is all about control. Control the ball, the power, the placement, the point, the set, the match. Control yourself. The tennis season circles the globe for about 11 months a year. Those months are packed with airports, training, matches, sponsors, the press, and then more airports. There's often an entourage with you to maintain that control: coaches for your game, agents and managers to handle the business, nutritionists and trainers for your body, family and psychologists for mental support.