The rules of tennis are very clear when it comes to bathroom breaks. The rules state that a bathroom break must only be taken during a set break during a match or if it is taken during a set, it must happen before a player’s own service game. If a player takes a break at any other time during the match, they do so on their own prerogative and they will be docked points for the time they spend in the bathroom. The reason this is done is because a player is discouraged from taking too many bathroom breaks during a match and disrupt the flow of the match and the other player. Also it is a way to make sure that a player does not do anything illegal during a bathroom break or cheat in any way.