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A serve (or, more formally, a service) in tennis is a shot to start a point. A player will hit the ball with a racquet so it will fall into the diagonally opposite backside box without being stopped by the net. Normally players begin a serve by tossing the ball into the air and hitting it (usually near the highest point of the toss). The ball can only touch the net on a return and will be considered good if it falls on the opposite side. If the ball contacts the net on the serve but then proceeds to the proper backside box, it is called a let; this is not a legal serve in the major tours (but see below) although it is also not a fault. Players typically serve overhead, but serving underhand, although rare, is allowed. The serve is the only shot a player can take their time to set up instead of having to react to an opponent's shot.
The serve is one of the more difficult shots for a novice, but once mastered it can be a considerable advantage. Advanced players can hit the serve in many different ways and often use it as an offensive weapon to gain an advantage in the point or to win it outright. Because of this, professional players are expected to win most of their service games, and the ability to break an opponent's serve plays a crucial role in a match.
An attempt at a serve may result in one of the following outcomes:
A good serve occurs when a legally-delivered ball lands in the cross-court service box without touching anything in flight. The point then continues with normal play.
A let occurs when a legally-delivered ball lands in the cross-court service box having touched the net cord (but not the net post or any other object). Play stops immediately, and the server is allowed another attempt.
There are multiple reasons why a service attempt may result in a fault.
After a fault, play stops immediately. If there has been only one fault on this point, the server is then allowed another attempt. If there have been two faults on this point, the point is awarded to the receiver: this is known as a double fault.
On a service, the receiver is required to allow the ball to bounce before attempting to hit it. In the extremely rare event of the receiver's racket or body touching a legally-delivered ball before it bounces, the point is immediately awarded to the server.
A first serve is made when there has been no fault on the point; a second serve occurs when there has already been one fault on the point. On a second serve, the server is in danger of losing the point if there is another fault.
The rules make no distinction between the first and second serve. However, the tactics used are different. The first serve is typically struck with the maximum power, skill, and deception the player is capable of with the aim of winning the point either outright or on the next stroke, by forcing the receiver into a disadvantageous position. The second serve is usually more conservative to avoid getting a double fault, and is typically hit with less power or a higher curve.
There are two popular stances in the tennis serve: the platform stance and the pinpoint stance.
In the platform stance the feet are kept about shoulder-width apart throughout the serve, providing stable support and easy weight transfer from the back to the front foot. The hips rotate, and sometimes the back foot swings forward to complete the hip rotation.
In the pinpoint stance, the feet start apart, but as the serve unfolds, the back foot slides forward until it is adjacent to the front foot. As a result, the feet provide a very small base of support and balance may be a problem.
The pinpoint serve provides better velocity, since the feet come together as a single unit, allowing them to push harder against the ground. However, the center of gravity moves more than in the platform stance, so the player must have good body control in order to contact the ball consistently.
Players will sacrifice some power with the platform serve, but their balance will be better so they should be more consistent. It's still possible to produce good power with the platform serve—some big servers, such as Milos Raonic and Roger Federer, use a variation of a platform stance.
The serve each player uses will depend on their individual abilities and what they need the most—power or consistency. If they already have good body control but would like to produce extra power, they could try the pinpoint stance. If consistency is their problem, they can use the platform stance.
In the game of tennis, there are four commonly used serves: the "flat serve", the "slice serve", the "kick serve", and the "underhand serve". Slice serves can be hit with spin to either the left or the right, and this distinction is often utilised to make the serve unpredictable and throw the opponent off balance. All of these serves are legal in professional and amateur play.
The term kick serve is ambiguous. It may be used as a synonym for the twist serve or the American twist. However, kick serve is commonly used to refer to any serve with heavy topspin or kick on it.
Servers can gain a tactical advantage by varying the type of serve and the ball's placement. The flat serve and slice serve are used primarily as first serves because they are more likely to yield an ace or force an error, although they require high accuracy. Second serves usually have topspin or kick on them, which makes them less likely to land in the net or out of bounds. Kick serves also make a good change-up[clarification needed] as a first serve.
A flat serve is hit with a Continental grip (holding the racket as if it were an axe) and a swing path directly through the ball, which causes the ball to cut quickly through the air without spinning. Some professional players can hit flat serves at speeds near 150 miles per hour (240 km/h).
A flat serve must come close to the net therefore having a small margin for error. Therefore, flat serves are usually hit straight across the center, where the net is lowest. They are usually delivered as first serves, when the server does not risk a double fault. The ball is thrown straight above for the optimal serving point.
A slice serve is hit with sidespin, which requires the server to brush the back of the ball toward their dominant side with the racket. It is commonly hit with the Continental grip or the Eastern backhand grip (using the forehand face of the racket). The ball is thrown slightly to the dominant side of the server then is struck laterally on the server's dominant side.
For a right-handed player, a sliced serve's sidespin causes the ball to curve leftward. When the ball bounces, it skids and curves farther leftward. The curve of a good slice serve can draw the receiver 10 feet (3.0 m) wide of the singles sideline to play the ball. Since a slice serve has little or no topspin on it, it cannot be aimed high over the net and has little margin for error. Therefore, it is generally used as a first serve. It can be used to ace the receiver, to draw the receiver out of position, or to "jam" the receiver with a serve curving sharply towards his or her body.
In professional and amateur tennis, the reverse slice serve is rarely used except as a novelty. As the word reverse is defined, one must hit opposite to the side and opposite to the path of the slice struck serve.[clarification needed]
Holcombe Ward and Dwight Davis introduced the kick/American twist serve in the late 1800s. The kick serve is generated by tossing the ball over the head, then hitting it laterally on the server's non-dominant side brushing upward toward the dominant side. When hit correctly, the ball clears the net in a high arc with heavy topspin, causing the ball to dive into the service box. Upon hitting the surface of the court, the ball may bounce high directly toward the receiver for a kick serve, or to the left for the receiver for an American twist serve. The physics of the spinning ball in flight involves the Magnus effect because the spinning ball creates a whirlpool of air around itself. The Twist Serve is a more extreme version of the Kick Serve, which involves more brushing of the ball from the 7-8 o clock position to the 1-2 o clock position, and faster swing speeds. If performed exceptionally, it can completely change the direction of the ball movement away from the other player, although this requires a very strong and flexible back.
In professional and amateur tennis, the reverse kick/American twist serve is rarely used except as a novelty. As the word "reverse" is defined, one must hit opposite to the side and opposite to the path of the kick struck serve.[clarification needed]
The underhand serve is struck below shoulder level. In children's tennis, young children may be encouraged to use the underhand serve on 36 feet (11 m) courts. Although this serve is technically legal, it may be seen as cowardly and unsportsmanlike in adult tennis. Some notable examples include Michael Chang's in the Round of 16 at the 1989 French Open against Ivan Lendl, and Martina Hingis was booed by the crowd for hitting one at the 1999 French Open.
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