What Is an Ace in Tennis? Meaning and Rules

An ace in tennis is a legal serve that the receiver does not touch. Because the ball lands in the correct service box and goes untouched, the server wins the point immediately.

Aces are recorded as a statistic for individual players and matches. They are commonly associated with fast serves, but a serve does not need to be extremely powerful to count as an ace. Placement, spin, disguise and the receiver’s position can all make a serve unreturnable.

How a tennis ace works

For a serve to count as an ace, it must meet the normal requirements of a legal serve:

The server must deliver the ball from behind the baseline.
The ball must land in the diagonally opposite service box.
The receiver must not touch the ball with the racket or body.
The serve must not be called a fault or a let.

If all of these conditions are met, the point is awarded to the server. An ace can happen on either a first serve or a second serve. It can also occur in singles or doubles.

Ace vs service winner

The difference between an ace and a service winner is whether the receiver touches the serve. An ace is completely untouched. A service winner occurs when the receiver gets a racket to the ball but cannot return it successfully, often because the serve is too fast, wide or well placed.

For example, a wide serve may pull the receiver outside the singles sideline. If the receiver misses it without making contact, the result is an ace. If the receiver reaches it and clips the ball but cannot keep it in play, it is generally recorded as a service winner instead.

Does serve speed determine an ace?

No. Serve speed alone does not determine whether a delivery is an ace. A slower serve aimed at the corner can be just as effective as a powerful serve down the middle. Players often create aces by targeting the receiver’s weaker side, changing direction at the last moment or using slice and kick serves to move the ball away from the returner.

A fast serve that the receiver touches is not an ace. Conversely, a well-disguised serve with moderate speed can count as an ace if it lands legally and goes untouched.

How aces affect the score and match statistics

An ace is worth one point, just like any other point won during a tennis game. It does not provide extra points or change the scoring system. The point may produce a score such as 15–0, 30–15 or deuce, depending on the previous points in the game.

Match statistics usually show the number of aces hit by each player. Analysts often compare aces with double faults, first-serve percentage, first-serve points won and break points saved to assess serving performance. A high ace total can indicate effective serving, although it does not by itself determine who played better.

Common situations that are not aces

Double fault: The server misses both attempts, giving the receiver the point.
Service winner: The receiver touches the serve but cannot return it into play.
Let: The serve touches the net and still lands in the correct box, so the serve is replayed rather than counted as a point.
Fault: The serve misses the required service area or breaks another serving rule.

A serve that lands in the box but bounces twice before the receiver can reach it may be scored according to the relevant competition’s statistical conventions. In standard match statistics, an untouched serve that wins the point is generally classified as an ace when it satisfies the ace definition.

Why players aim for aces

An ace is one of the most efficient ways to win a point because it prevents the receiver from starting a rally. It can also help a server protect a service game, save energy and avoid giving an opponent opportunities to attack.

Players usually pursue aces by combining placement and variation. Common targets include the outside corner, the body and the centre line. The best serving strategies are not always the ones that produce the most aces; a serve that creates a weak return can be valuable even when it is recorded as a service winner rather than an ace.

Frequently asked questions about tennis aces

Can a second serve be an ace?

Yes. A second serve can be an ace if it lands in the correct service box and the receiver does not touch it. Second serves are often slower and use more spin, but accurate placement can still make them unreturnable.

Does a let count as an ace?

No. A let means the serve is replayed. The server must win the point with a subsequent legal serve for an ace to be recorded.

Can an ace happen in doubles?

Yes. The same basic definition applies in doubles: the legal serve must go untouched by the receiving team and win the point immediately.