There are many ways in which you can improve your tennis serve without really changing your stroke and these involves changing the way you toss the tennis ball, changing your grip or changing where you position yourself on the service line. When doing the tennis serve, do not attempt to make a pattern. Keep your opponents guessing about which tennis serve will come. Improving your service may be difficult for some but it is the easiest one to improve provided you have the right method. Constant practice also helps in improving your service. Patience also plays a vital role in achieving a good serve.