In most recreational, club and junior tennis, players call the lines on their own side of the net. When you think your opponent has missed a call, stay calm, politely ask whether they are sure, and accept their answer, because the player on that side has the final say in unofficiated play. If calls keep going against you in a tournament, ask for a roving official or referee to watch the match. When you are the one making calls, follow the golden rule of fair play: if you are not sure a ball is out, it is in, and correct any mistake you make immediately, even if it costs you the point.
This guide explains the principles behind line calling, how to question a call respectfully, what to do when you make a mistake, how to get help from officials, doubles line calling, and common mistakes.
Line calling principles
| Principle | What it means |
|---|---|
| Your side, your call | Each player calls balls landing on their own side of the net |
| Benefit of the doubt | If you are not certain a ball is out, it is good |
| Call promptly | Make out calls immediately, loudly or with a clear hand signal |
| Correct your own mistakes | If you realise you called a good ball out, correct it straight away |
| Opponent’s calls stand | In unofficiated play, you cannot overrule your opponent’s call |
| Ask, don’t argue | You may ask if they are sure, but not demand a change |
How to question a call respectfully
- Pause and breathe: do not react angrily or immediately.
- Ask politely: a simple “Are you sure?” is acceptable.
- Accept the answer: if they say yes, move on.
- Keep perspective: one call rarely decides a match; your reaction can affect the next several points.
- Get help if it keeps happening: in tournaments, ask the referee or a roving official to watch the court.
When you make a mistake
Everyone makes wrong calls sometimes. If you call a ball out and then realise it was good, correct the call immediately. Under widely used codes of conduct for unofficiated tennis, correcting your own out call usually means your opponent wins the point, because your call stopped play. If you are unsure whether a ball touched the line, the ball is good. Being honest about your own calls builds trust and makes the match more enjoyable for everyone.
Getting help from officials
In many tournaments, roving officials walk between courts. You can ask the tournament desk or a roving official to watch your match if you believe calls are consistently wrong. Officials watching a match may overrule clearly incorrect calls and can issue warnings under the tournament’s code of conduct. In matches with a chair umpire and line judges, players do not call lines, and umpires may overrule clear mistakes. At the highest levels, electronic line calling has replaced line judges at many events.
Doubles line calling
In doubles, either partner can make a call. If one partner calls the ball out and the other believes it was good, the ball is good, because doubt goes to the opponents. Partners should communicate quietly and agree on calls quickly.
Staying composed
- Focus on what you can control: your next point.
- Use a short reset routine between points, such as walking to the back fence.
- Avoid sarcasm, gestures or comments about the opponent’s honesty.
- Remember that most bad calls are honest mistakes.
For the full rules and etiquette, refer to the ITF Rules of Tennis and the USTA’s The Code or your national federation’s guidance for unofficiated matches. Tournament codes of conduct may add specific procedures.
Common mistakes
- Arguing repeatedly: escalates tension and can lead to code violations.
- Retaliating with bad calls: never acceptable and against the rules.
- Calling balls on the opponent’s side: only call balls on your side unless asked.
- Late calls: calls must be made promptly.
- Not asking for help: use officials when available.
Common line-call situations and what to do
Most disputes follow a handful of familiar patterns. Knowing the expected response ahead of time makes it much easier to stay calm in the moment.
| Situation | What the guidelines expect |
|---|---|
| You are unsure whether a ball was in or out | Give your opponent the benefit of the doubt and call it good |
| The ball touched any part of the line | The ball is in |
| Your opponent calls a ball out very late | Politely ask them to make calls promptly; if it continues, request an official |
| You called a ball out, then realised it was in | Correct the call; in most cases the point goes to your opponent |
| You disagree with your opponent’s call | Ask once if they are sure, then accept the answer |
| A ball mark is visible on clay | Players may check the mark, and the mark generally decides the call |
| Calls keep going against you | Stop play calmly and ask a roving official or tournament desk for help |
Understanding The Code
In the United States, unofficiated matches are guided by a USTA publication called The Code, which sets out the principles of fair play and line calling. Many other national associations have similar guidance. A few principles appear again and again: players should call balls on their own side, calls should be made quickly and clearly, any doubt should be resolved in the opponent’s favour, and a player should not call a ball out unless they clearly saw space between the ball and the line. Reading these principles once before a tournament puts you ahead of most opponents.
Line calling at the professional level
Professional tennis looks very different. Many top events now use electronic line calling, which calls every line automatically, while others use line judges with player challenges reviewed by a ball-tracking system. These tools do not exist at most club and junior events, so recreational players still rely on honesty, clear communication and the rules for self-officiated play.
A simple routine for handling a disputed call
- Pause, take a breath and avoid reacting in the heat of the point.
- Ask once, politely, whether your opponent is certain.
- Accept the answer and play on, even if you still disagree.
- If disputes keep happening, request an official at the next changeover.
- Reset mentally with your normal between-point routine before the next serve.
Rules and procedures vary by association and event, so check the current ITF Rules of Tennis and your national association’s guidance for official wording.
Frequently asked questions
Can I overrule my opponent’s line call?
No. In unofficiated play, the player on that side makes the final call. You can ask if they are sure or request an official.
What happens if I call a ball out by mistake?
Correct it immediately. In most unofficiated play, your opponent usually wins the point.
What if my doubles partner and I disagree on a call?
The ball is good, because any doubt goes in favour of the opponents.
