What Does 'Ad In' Mean in Tennis? Explained

By Sarah Miller · March 5, 2050

In tennis, ‘Ad’ (short for ‘advantage’) indicates the player who wins the next point after deuce will win the game. If the server has the advantage, it’s called ‘ad in’; if the receiver has it, it’s ‘ad out’.”

Understanding ‘Ad In’ in Tennis Scoring

The term ‘ad in’ is a fundamental part of traditional tennis scoring and appears during deuce situations. When both players reach 40-40 in a game, the score is called ‘deuce.’ From this point, one player must win two consecutive points to claim the game. The first player to win a point after deuce gains the ‘advantage.’ If the server wins that point, the score is announced as ‘ad in’. If the receiver wins it, the score becomes ‘ad out.’

‘Ad in’ specifically refers to the server having the upper hand after deuce. Should the server win the following point, they win the game. However, if they lose the next point, the score returns to deuce, and the process repeats until one player secures two consecutive points.

Why Is It Called ‘Ad In’?

The ‘in’ in ‘ad in’ signifies that the advantage is with the server—the player ‘in’ serve. This terminology helps distinguish between which player holds the edge after deuce. It’s a concise way for players, officials, and fans to track the momentum shift within a tightly contested game.

How Ad Scoring Works: Step-by-Step

Players start at 0 (love), then progress to 15, 30, and 40.
If both players reach 40-40, the score is deuce.
The next point winner gains ‘advantage’—either ‘ad in’ (server) or ‘ad out’ (receiver).
If the player with the advantage wins the next point, they win the game.
If they lose the next point, the score returns to deuce.

Example Game Flow

Score: 40-40 (Deuce)
Server wins point: ‘Ad In’
Server wins next point: Server wins game
If receiver wins after ‘ad in’: Back to deuce

Differences Between Ad In, Ad Out, and Deuce

To clarify the distinctions, here’s a breakdown of key scoring terms used after 40-40:

Score Term	Meaning	Point Needed to Win Game?	Who Has Advantage?
Deuce	40-40; must win two consecutive points	No	Neither
Ad In	Server won point after deuce	Yes (if wins next point)	Server
Ad Out	Receiver won point after deuce	Yes (if wins next point)	Receiver

Table data source:1, 2

The table illustrates how ‘ad in’ gives the server a pivotal opportunity to close out the game. Statistically, servers win approximately 60-70% of ad points on hard courts due to the advantage of serving under less pressure. This underscores the strategic importance of holding serve when reaching ad in.

When Is ‘Ad’ Scoring Used?

Traditional ‘ad’ scoring is standard in most professional and amateur tennis matches, including Grand Slam tournaments like Wimbledon, the US Open, and the Australian Open. However, some formats use simplified scoring:

Singles Matches: Always use ad scoring unless specified otherwise.
Doubles Matches: Often use no-ad scoring in recreational leagues to save time.
Junior Tournaments: May implement no-ad scoring to shorten match duration.
World TeamTennis: Uses no-ad scoring—first point after deuce wins the game.

No-Ad Scoring vs. Traditional Ad Scoring

In no-ad scoring, the first player to win a point after deuce wins the game outright. This eliminates the need for ‘ad in’ or ‘ad out’ calls. While faster, it reduces the emphasis on mental toughness and clutch performance that ad scoring rewards.

Frequently Asked Questions About ‘Ad In’ in Tennis

What does ‘ad in’ mean in tennis?

‘Ad in’ means the server has gained the advantage after a deuce. If the server wins the next point, they win the game. If they lose it, the score returns to deuce.

What is the difference between ‘ad in’ and ‘ad out’?

‘Ad in’ means the server has the advantage; ‘ad out’ means the receiver has it. The ‘in’ refers to the server being ‘in’ serve, while ‘out’ refers to the receiver.

Can a game go on forever with repeated deuces?

Theoretically, yes, but practically, players eventually win two consecutive points. There is no limit to how many times deuce can occur, making ad scoring a test of endurance and focus.

Do all tennis matches use ‘ad in’ scoring?

No. Most professional singles matches do, but doubles, junior events, and recreational leagues often use no-ad scoring to shorten playtime.

Why is advantage scoring important in tennis?

It adds drama, strategy, and psychological intensity. Players must handle pressure and maintain focus over multiple high-stakes points, showcasing true competitive resilience.