Tennis court etiquette comes down to six habits: call your own lines honestly and call them promptly, never walk behind a court while a point is live, hold your serve until the neighbouring rally ends, keep the score called out loud before every serve, retrieve and return stray balls the moment the point is over, and settle a disputed call by replaying the point rather than arguing it. Almost every awkward moment in recreational and league tennis traces back to one of those six.
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Etiquette is what you learn on league night, and league night is what these are printed for.
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None of this is written down in one place, which is why so many players learn it by getting it wrong in front of strangers. What follows is the version that actually matters on a public court or a Tuesday league night, in the order you will need it.

Call your own lines, and call them fast
In league and recreational play there is no umpire. You call the balls that land on your side, your opponent calls theirs, and that is the whole system. It works only if two things are true: you call promptly, and you give the benefit of the doubt away from yourself.
Prompt means before your return crosses the net. A call that arrives after you see where your shot landed is not a call, it is a negotiation. If you genuinely did not see it, the ball was good. That is not generosity, it is the rule.
The corollary is that you do not call your opponent's side. If a ball lands near their baseline and they play it, it was in. Asking "are you sure?" once is fine. Asking twice is a different conversation.
Never cross behind a live point
This is the one that irritates experienced players most, and the one newcomers break most often. If your ball rolls onto the next court, you wait. You wait until their point ends, you make eye contact, and then you ask. Walking behind a baseline while someone is serving is both rude and genuinely dangerous.
The same applies to arriving at your court. If the players next to you are mid-rally and your route crosses their court, stop and wait. It costs you eleven seconds.
Hold your serve while the next court is in play
If the court beside you is in the middle of a long point, do not start yours. The sound of a serve carries and the movement in peripheral vision is genuinely distracting. Wait for the point to end. On a busy public court this is the single clearest signal that you know what you are doing.
Call the score out loud, every time
Server calls the score before every point, loudly enough that the other end hears it. Your score first, then theirs. This one habit prevents most of the disputes that ruin the last game of a set, because a disagreement surfaces at 15-30 instead of at deuce twenty minutes later.
If you and your opponent disagree about the score, go back to the last point you both agree on and replay from there. Do not split the difference.
Return balls properly, and only between points
Stray balls get returned when the point is over, not during it. Roll them along the back fence to the player at that end, or hold them until there is a break. Never fire a ball back across a live court.
If a ball from another court comes onto yours mid-point, call a let and replay the point. Both sides replay it. Nobody wins a point because a stranger's ball rolled through.
Settle a dispute by replaying, not by arguing
You will eventually have a call you genuinely disagree about. The convention is simple and it protects the friendship: replay the point. Not "take two", not a concession, just play it again. A replayed point costs thirty seconds. An argument costs the rest of the match and sometimes the rest of the season.
The unwritten league-night extras
League play adds a few conventions that public courts do not.
- Warm up your opponent, not yourself. Feed them balls to their backhand as well
- as their forehand. Five minutes each way is standard.
- Introduce yourself and shake hands before, and again after. Every time, win or
- lose.
- If you are running late, tell your captain, and your captain tells theirs.
- Silence is the thing that annoys people, not lateness.
- Do not coach from the sideline during a match unless your league explicitly
- allows it. Most do not.
- Bring your own water and a spare grip. Borrowing is fine once.
What to wear so you are not the story
Most clubs and public facilities have no dress code at all beyond non-marking soles, which genuinely matter: black-soled trainers leave marks that groundstaff have to scrub off. Some private clubs and some tournaments require predominantly white. League play almost never does.
Beyond footwear, the practical version is: something you can move in, something with pockets or a way to carry a second ball, and something you do not mind sweating through. A collared shirt is required at a small number of private clubs and nowhere else in American recreational tennis. If you are unsure about a specific venue, ask your captain before the match rather than after.
The short version
Call promptly and honestly. Wait for the point next door to finish before you walk or serve. Say the score out loud. Return balls between points. Replay anything you genuinely dispute. Shake hands at both ends of the match.
Six habits, and you will never be the person the group chat talks about afterwards.