AP Photo

BABOLAT WANTS TO give you a reason to buy a new tennis racket. Its pitch? This racket has a computer chip that can help you take a long, honest look at your forehand, backhand or serve and fix it—based on empirical evidence. Where you make contact with the ball. How hard you hit it. What kind of spin you apply. How consistent you are. If it works, it could be the first true advance in tennis rackets in a dozen years or more.