Deuce and Advantage in Tennis: What They Mean and How a Game Is Won

Deuce is the score when both players have won three points in a game, written 40–40 rather than 40-all in most scoring conventions. From deuce, a player cannot win the game with one point. They must win two in a row.

How advantage works

The player who wins the point after deuce has the advantage. If they win the following point as well, they take the game. If they lose it, the score returns to deuce and the process begins again. A game can therefore return to deuce any number of times, and long deuce games are common at every level.

Announced aloud, the score is called as "advantage" followed by the name or side of the player who leads, "advantage server" or "advantage receiver" in umpired matches, and by surname in professional play.

Why two points and not one

The two-point margin at deuce mirrors the margin requirements that run through the rest of tennis scoring. A set cannot be won 6–5; it requires a two-game margin or a tiebreak. A tiebreak cannot be won 7–6; it requires a two-point margin. The same principle applies within a game: once the players are level at three points each, one point is not treated as sufficient evidence of superiority.

Deuce court and advantage court

The two service boxes take their names from this scoring. The right-hand box, as the server faces the net, is the deuce court, because every deuce point is served there. The left-hand box is the advantage court, because the point played at advantage is served from the left. Coaches and commentators use the terms constantly, and they describe court position rather than the score at any given moment.

Which side a player prefers has tactical consequences. A right-handed player serving into the advantage court naturally swings the ball out wide to a right-hander's backhand, which is why the ad court is where many players look for their most reliable serve at pressure points.

No-advantage scoring

Some formats replace advantage with a single deciding point at deuce, with the receiver choosing which side to receive from. This shortens matches and is used in a good deal of doubles, college tennis and recreational league play. It is a permitted alternative procedure rather than the default; the ITF Rules of Tennis set out the standard game and the approved alternatives, and each competition publishes which it uses.

Why deuce games decide matches

A game reaching deuce is already close, and the two-point requirement extends it further. That matters statistically: at most levels the server is expected to hold, so the games that reach deuce are where breaks actually happen. A player who wins a disproportionate share of deuce games will win far more sets than their overall point-win percentage suggests.

This is why match analysis pays attention to points won from deuce separately from points won overall. Two players can win a near-identical number of points across a match and finish with very different scores, and the distribution of those points across deuce games is usually the explanation.

Serving and receiving at deuce

Because deuce is always served into the right-hand box and advantage into the left, players know in advance which serve they will need at the critical moments of a close game. A right-handed server facing a right-handed receiver has a natural wide serve to the backhand available in the advantage court, and a serve into the body or down the T available at deuce.

Receivers plan around the same geometry in reverse. Knowing that the ad-court point is the one that ends the game, many receivers position slightly differently there, accepting a weaker return position on the wide serve in exchange for covering the serve their opponent is most likely to trust under pressure.