An ace is a legal serve that lands in the correct service box and that the receiver cannot touch with their racquet. Most aces come from accurate placement to the T or the wide corner, a consistent toss that hides the direction of the serve, and good leg drive and pronation for pace. Placement and disguise usually matter more than raw speed. A well-placed serve at moderate pace can beat a returner who guesses wrong, while a very fast serve down the middle of the box is often returned. This guide explains what counts as an ace, the best targets, the technique that creates pace and disguise, how to practice, when to go for an ace and the mistakes that lead to double faults.
Rulebook note: Serving rules, including foot faults, lets and which service box to serve into, come from the ITF Rules of Tennis. National federations such as the USTA, tours and leagues may add their own regulations, including rules on lets in some formats. Check the current rules for your event.
Health note: Serving places repeated stress on the shoulder, elbow and back. Warm up fully before serving hard, build serve volume gradually and include shoulder and core strengthening in your training. Stop and seek professional advice if you have pain that persists or affects your motion.
What counts as an ace
An ace is a serve that lands in and that the receiver fails to touch with the racquet. A serve that clips the net and lands in the box is a let and is replayed under standard rules, rather than counting as an ace. Aces are common at high levels on faster surfaces and among players with big serves, but they are possible at any level with good placement. Serves that the receiver touches but cannot return in play are often called service winners, and they are just as valuable in a match.
Serve targets
| Target | Effect | Best used |
|---|---|---|
| T (down the middle) | Shortest distance, little angle for the return | Flat or kick serves, especially from the deuce court for right-handers |
| Wide | Pulls the returner off the court | Slice serves, especially from the deuce court for right-handers |
| Body | Jams the returner | Rarely an ace, but forces weak returns |
The T and wide targets produce most aces because they force the returner to move the farthest or leave them the least time. Aiming slightly inside the lines, rather than right on them, gives a margin for error while still being effective.
Technique for pace
Serve pace comes from the whole body working together, not just the arm. Start with a relaxed, continental grip, which allows the racquet to swing through with pronation. Use a trophy position with the knees bent and the body coiled. Drive up and into the court with the legs, letting the hips and trunk rotate. The hitting arm follows, reaching high for contact. As the racquet meets the ball, the forearm pronates, turning the racquet face toward the target. Stay relaxed, since tension in the arm reduces racquet speed. A smooth rhythm usually produces more pace than a hurried, forceful swing.
The toss and disguise
A consistent toss is one of the keys to aces. If your toss changes for each type of serve, alert returners can read your direction or spin before you hit. Try to use a similar toss position for every target, and let changes in the racquet face and swing path determine the direction and spin. Keep your body position and routine the same before each serve. The harder it is for the returner to read the serve, the more likely a well-placed serve becomes an ace.
Using spin to create aces
Flat serves travel fastest and can produce aces through speed and placement, especially down the T. Slice serves curve sideways and can pull returners wide, often producing aces out wide from the deuce court for right-handed servers, or into the body. Kick serves bounce high and away, making them effective for placement and forcing weak returns, though they produce fewer outright aces. Mixing spins and speeds keeps the returner guessing, which is often what creates aces.
Reading the returner
Watch where the returner stands and how they react. If they stand far to one side to protect their weaker return, the other side may be open. If they lean or move early, a serve in the opposite direction can catch them out. Notice which serves they struggle with, such as high kicks or wide slices, and use those at key moments. Keeping track of patterns through a match can help you choose targets that are more likely to produce aces.
Step-by-step: serving for aces
- Choose a target before each serve: T, wide or body.
- Use your routine to stay relaxed and consistent.
- Toss consistently slightly in front and toward the hitting side.
- Load the legs in the trophy position.
- Drive up and reach high for contact.
- Pronate through contact toward the target.
- Follow through and land inside the court.
- Recover quickly for the return in case the serve comes back.
Practice drills
Place targets, such as cones or towels, in each corner of the service box and serve to them in sets of ten. Track how many serves hit the target from each side. Practice the same toss for different targets by having a partner or coach call the target just before you serve. Play serve games where you score points only for serves that hit the chosen target or produce unreturnable serves. Film your serve from the side and behind to check your toss, leg drive and contact point. Include second serves in every practice, since a reliable second serve lets you take more risk with the first.
When to go for an ace
Going for aces on every serve can lead to low first-serve percentages. Many players aim for bigger, riskier first serves at moments of less pressure, and more reliable serves at critical points, although some players prefer to serve aggressively at big moments. A useful approach is to aim for a high first-serve percentage with good placement, and to save the most aggressive serves for when the score allows. Knowing your own serve percentages helps you make better decisions.
Building serve power safely
Power develops over time through better technique, strength and flexibility. Strengthen the legs, core, back and shoulder, and work on mobility, especially in the upper back and shoulders. Increase serving volume gradually, particularly when returning from time off. Avoid serving at full effort when fatigued, since technique tends to break down. Many players benefit from lessons focused on the serve, which can improve both pace and safety.
Common mistakes
- Going for maximum speed instead of placement.
- A different toss for each serve that gives away direction.
- Aiming right on the lines with no margin.
- Arm-only serves without leg drive.
- Tension in the arm and grip.
- Neglecting the second serve.
- Serving hard without warming up.
Frequently asked questions
What counts as an ace in tennis?
A legal serve that lands in the correct service box and that the receiver does not touch with the racquet.
Where is the best place to serve an ace?
The T and the wide corner produce most aces, because they give the returner the least time or force them to move farthest.
Do you need a fast serve to hit aces?
Pace helps, but accurate placement, disguise and spin variety matter at least as much. Well-placed serves at moderate speed can produce aces.
