I have written yesterday about running shoes that every runner needs. If you are not a runner but a tennis player, a piece of equipment you are always going to need are tennis balls. If you play tennis on a regular basis, you cannot do without them. In my opinion, it is the best idea to look for the same equipment as professional tennis players use. Only that way can you be sure that your tennis experience is going to be similar to the experience of professional tennis players. Tennis balls from Millet Sports come in small or large numbers. You can buy as many of them as you want.