The players alternate serving games until the end of the match. In doubles, at the start of a match, one team selects a server for the first game of the set, and then the other team selects a server for the second game. The partner of the server of the second game serves the third game. The players continue to alternate serving in the same way until the end of the set. The server can make two attempts to put the ball in the diagonally opposite service court. If the first serve of a point lands outside the proper service court, the server may make a second serve. If the second serve also lands outside the court, the receiver automatically wins the point. A serve that touches the net on its way over and then lands in the proper court is said to be a "let" serve, and the server does it again (regardless of whether it is a serve or any other shot), it is considered to be in the court; it is good shot, and it must be played.
Tennis rules provide a fair means by which competition can take place that favor neither player. And each rule must be followed. When a match is about to begin, the players determine who is to serve first and determine who will play first on each end of the court with a "toss." The toss, nowadays is performed by spinning a racket and the butt of the racket faces an opponent, the letter on the butt of the racket is covered with one hand while the racket is turned several times, and the opponent calls "up"" or "down"", and so on. The winner of the toss has three options: the winner can elect to serve first, can select which end of the court to play first, and can ask the opponent to make a choice. .
Each point in tennis games begins with a server's attempt to hit the ball so that it bounces in the diagonally opposite service court. The server must stand with both feet behind the baseline (outside the court) and between the center mark and the sideline. The server may not walk or run as a part of the service motion until contact is made with the ball.
