The sport of tennis has been played in one form or another for more than 800 years. It can trace its roots to games played by monks in the 12th century. Through the years the game has evolved from one in which the ball was struck with the hands to the modern game in which rackets are used to propel the ball in excess of 150 miles per hour. From the sport of the elite to the sport played by elite athletes, tennis has grown immensely in the past 135...