There are simple things that can become a nuisance when playing tennis. Noisy people on the bench, bad weather, and most of all other player's tennis balls flying or rolling into your own court. Not only is this a nuisance but it can also pose a danger. You can become seriously injured when you accidentally step on a loose tennis ball and the fast flying tennis balls can easily hurt you as well. If the tennis court isn't the only court in the area (which is rarely the case for clubs and recreational facilities) there has to be some protection available for the players from each other.