What Does Ace Mean in Tennis? Definition & Facts

By Sarah Miller · December 21, 2030

An ace in tennis refers to a serve that lands in the correct service box and is not touched by the opponent, resulting in a point for the server. It is one of the most effective offensive weapons in the game, showcasing precision, speed, and placement.

What Is an Ace in Tennis?

In tennis, an ace occurs when a player serves the ball into the correct service box and the opponent fails to make any contact with it. The point ends immediately, and the server wins the point outright. Aces are typically delivered with high velocity, sharp angles, or deep placement that makes them extremely difficult to return.

Key Characteristics of an Ace

The serve must land within the boundaries of the correct service box.
The receiving player does not touch the ball with their racket or body.
The point is awarded solely to the server without any rally.
Aces can occur on first or second serves, though they are more common on first serves due to higher speed.

How Aces Impact the Game

Aces are more than just flashy points—they play a crucial strategic role in modern tennis. Players with strong serves use aces to conserve energy, maintain momentum, and apply psychological pressure on opponents.

Strategic Advantages of Acing

Efficiency: Winning points without rallying saves physical effort.
Momentum Control: A string of aces can disrupt an opponent’s rhythm.
Confidence Boost: Delivering aces reinforces a server’s dominance.
Match Statistics: High ace counts often correlate with match victories, especially in men's tennis.

Top Players Known for Aces

Certain players have built reputations around their powerful and accurate serving. These athletes consistently rank at the top for aces per match on the ATP and WTA tours.

<2015> <2010> <2017> <2012> <2023>

Player	Tournament	Year	Aces in Match
Ivo Karlović	Winston-Salem Open	45	Won
John Isner	Wimbledon	113	Won (in final set 70–68)
Roger Federer	Wimbledon	24	Won (Final vs Cilic)
Samuel Groth	Brisbane International	39	Lost
Carlos Alcaraz	US Open	18	Won (Final vs Medvedev)

Table data source:1, 2

The data shows that elite servers like Ivo Karlović and John Isner have recorded exceptionally high ace counts, often exceeding 40 in a single match. While high ace numbers don’t guarantee victory—Samuel Groth lost despite 39 aces—they significantly increase winning probability, especially on fast surfaces like grass and hard courts.

Difference Between an Ace and a Service Winner

It’s important to distinguish between an ace and a service winner:

Ace: The opponent does not touch the ball.
Service Winner: The opponent attempts a return but fails to get the ball back in play, often due to pace or placement.

While both result in a point for the server, only untouched serves qualify as aces.

Surfaces and Ace Frequency

The playing surface greatly influences how often aces occur:

Grass Courts (e.g., Wimbledon): Low bounce and fast speed favor big servers.
Hard Courts (e.g., US Open): Moderate pace allows for consistent power serving.
Clay Courts (e.g., French Open): Slower surface and higher bounce reduce ace frequency.

Players like Roger Federer and Novak Djokovic adjust their serving strategy based on surface conditions to maximize effectiveness.

Frequently Asked Questions About Aces in Tennis

Does an ace count as a fault if the receiver moves late?

No. If the serve lands in the correct box and the receiver doesn't make contact—even if they were preparing to move—the point is still an ace as long as no part of their body or racket touches the ball.

Can you get an ace on a second serve?

Yes, though it's less common. Second serves are usually slower and more spin-oriented for safety, but skilled players can still deliver unreturned second-serve aces, especially with kick or slice variations.

Who holds the record for most aces in a Grand Slam tournament?

John Isner holds the record for most aces in a single Grand Slam tournament with 113 during his historic 2010 Wimbledon match against Nicolas Mahut. He also leads the all-time ATP career aces list.

Do women hit fewer aces than men?

On average, yes—due to generally lower serve speeds—but top female players like Serena Williams and Iga Świątek regularly hit powerful aces. Serena averaged over 6 aces per match in her prime Grand Slam runs.

Is an ace counted if the opponent touches the ball with their body?

No. If any part of the opponent’s body or clothing touches the ball before it hits the ground, it is not an ace. The server wins the point only if the ball lands in and is completely untouched.