Key takeaways
- Code violations escalate on one scale at the Grand Slams, the ATP and the WTA: a warning, then a point penalty, then a game penalty for every further offence, with a default possible after the third.
- Time violations are a separate track: one warning, then a fault for a late server or a lost point for a late receiver.
- Between points a player has 25 seconds from the end of one point to the strike of the next first serve, and the 2026 ATP and WTA rulebooks require court clocks to show it at their main tour events.
- A medical time-out is three minutes of treatment for a distinct treatable condition, and muscle cramping cannot be treated with one, only at changeovers and set breaks.
- Read the specific rulebook for the event you are watching, because the three 2026 codes differ in wording and in a few penalties.
When a chair umpire announces "Code violation", a player has broken the code of conduct that governs professional matches. The penalty escalates on a fixed schedule: a warning for the first offence, a point penalty for the second, and a game penalty for the third and every one after it. That schedule is identical in the 2026 rulebooks of the Grand Slams, the ATP and the WTA. Slow play between points is handled on a separate track, the time violation, which is what the shot clock enforces. Medical time-outs sit under their own rules and allow three minutes of treatment for each distinct treatable condition.
Everything below is taken from the 2026 editions of the Official Grand Slam Rule Book, the ATP Official Rulebook and the WTA Official Rulebook, with the ITF Rules of Tennis for the baseline. Where the three codes differ, the difference is spelled out.
Two tracks, two penalty ladders
Most confusion comes from treating every penalty as the same thing. There are two systems running in parallel:
| Code violation | Time violation | |
|---|---|---|
| What triggers it | Misconduct: obscenity, ball or racquet abuse, verbal or physical abuse, coaching breaches, unsportsmanlike conduct, some delays | Being too slow: not serving within the time allowed, or a receiver not playing to the server's reasonable pace |
| First offence | Warning | Warning |
| Second offence | Point penalty | Server: a fault. Receiver: point penalty |
| Third and later | Game penalty each time; default possible | Same as the second, every time |
The Grand Slam rule book sets the code-violation ladder out as a three-line schedule: first offence, warning; second offence, point penalty; third and each subsequent offence, game penalty. The ATP and WTA codes use the same three steps. The ladder is written as a count of offences, not a separate count for each type of misconduct. In doubles, warnings and penalties are assessed against the team.
What counts as a code violation
The Grand Slam code lists the on-court offences one by one, with a definition for each:
- Audible obscenity: profane words said clearly and loudly enough to be heard by officials, ball persons or spectators.
- Visible obscenity: obscene gestures with the hands, racquet or balls.
- Abuse of balls: intentionally hitting a ball out of the court enclosure, hitting one dangerously or recklessly within the court, or hitting one with negligent disregard of the consequences.
- Abuse of racquets or equipment: intentionally and violently damaging equipment, or violently hitting the net, court, umpire's chair or another fixture out of anger.
- Verbal abuse: a statement about an official, opponent, sponsor, spectator or anyone else that implies dishonesty or is derogatory or insulting.
- Physical abuse: unauthorised touching of an official, opponent, spectator or other person.
- Coaching and coaches: breaching the conditions under which coaching is allowed. At the 2026 Grand Slams coaches sit in designated seats, verbal coaching is limited to a few words or short phrases when the player is at the same end, hand signals are allowed, and no coaching may interrupt play or hinder the opponent. Tennis coaching teams explained covers the wider rules.
- Unsportsmanlike conduct: any misconduct that is clearly abusive or detrimental to the sport.
Fines sit on top of the on-court penalty. At the Grand Slams most of these offences carry a fine of up to $50,000 per violation, and unsportsmanlike conduct up to $100,000.
When it becomes a default
After the third code violation, the official in charge decides whether each further offence is a default. That is the referee with the Grand Slam Chief of Supervisors at a major, the supervisor on the ATP tour, and the supervisor or referee on the WTA tour. A default can also follow a single violation if it is serious enough. At a Grand Slam, a defaulted player loses all ranking points and all prize money earned at that event, and any fines for the incident still apply. How tennis ranking points work explains why losing a tournament's points can matter for months afterwards.
A worked sequence
Suppose a player smashes a racquet in the first set: a code violation, warning. In the second set they swear loudly at a line call: second offence, point penalty, so the opponent is given a point. Later they abuse the umpire: third offence, game penalty, so the opponent is given a game. Any fourth offence is again a game penalty unless the referee or supervisor rules it a default. The player has broken three different rules, but the ladder only counts offences.
The 25-second rule and the shot clock
The ITF Rules of Tennis (Rule 29) set the timing every tour builds on: a maximum of 25 seconds between points, 90 seconds when players change ends, and a 120-second set break. Play is continuous after the first game of each set and during a tiebreak. The professional codes define the 25 seconds precisely. The clock runs from the moment the ball goes out of play at the end of a point until the ball is struck for the first serve of the next one. If that serve is a fault, the second must follow "without delay."
The clocks are now required equipment. The 2026 ATP rulebook makes shot clocks mandatory on each match court at all ATP Tour events, from the first day of qualifying through the final. The WTA requires "serve clocks", controlled from the chair umpire's tablet, at WTA 1000 Mandatory, WTA 500 and WTA 250 tournaments, again from the first day of qualifying.
What happens when the clock runs out:
- The first time in the match: a time violation warning.
- Later violations by the server: a fault. ATP umpires announce it as "Time Violation, 2nd Service."
- Later violations by the receiver: a point penalty, or a "loss of point" in the WTA's wording.
The receiver is not safe just because the server holds the ball. The ITF rules expect the receiver to play to the server's reasonable pace (Rule 21), and the Grand Slam and ATP codes let the umpire issue a time violation before the 25 seconds expire if the receiver is causing the delay.
When slowness becomes a code violation
A delay is moved onto the code-violation ladder, as "Delay of Game", in specific situations. At the Grand Slams these are delays caused by a medical condition, a refusal to play, or failing to return to court in time. The ATP and WTA apply it to slowness straight after a medical time-out or treatment, and the ATP's case book adds that a player who still has not resumed 25 seconds after a time violation receives a code violation. The WTA adds that a player cannot receive back-to-back time violations: consecutive delays become a Delay of Game code violation instead. The exceptions are lateness after its 10-minute heat-rule break, an authorised break or an additional break, which can draw repeated time violations instead.
Medical time-outs
A medical time-out is not a rest. Under the 2026 Grand Slam, ATP and WTA rules, it works like this:
- Evaluation comes first. The player asks, through the chair umpire, for the physiotherapist. The evaluation normally happens at the next changeover or set break, and play stops immediately only for an acute condition.
- Three minutes of treatment. The time-out starts when the physiotherapist is ready to begin treatment, not when they arrive. The ATP lets its supervisor extend the time at events with prize money of $50,000/43,000 or less.
- One per condition. A player gets one medical time-out for each distinct treatable condition. All signs of heat illness count as one condition, and so do musculoskeletal injuries along one kinetic chain. Two consecutive time-outs are allowed only when the physiotherapist finds at least two distinct treatable conditions at once.
- Some conditions are not treatable at all. General fatigue is on all three lists. The Grand Slam and ATP rules add anything that did not develop or worsen during the warm-up or match, and the WTA's list names chronic conditions such as overuse and recurring injuries. Supplemental oxygen is never permitted.
- Cramp is handled differently. No medical time-out is allowed for muscle cramping. Treatment happens only at changeovers and set breaks, with at most two change-of-ends treatments in a match. A player too cramped to continue may concede points or games to reach the next changeover. The Grand Slam and WTA rules add one exception: cramping that is a symptom of a heat illness can be treated as part of that condition.
- Bleeding can be given up to five minutes in total to bring under control.
- Lateness afterwards is punished. Any delay in resuming after a medical time-out or treatment is a Delay of Game code violation.
The ITF Rules of Tennis state the general version for all play: no extra time to recover condition, but one three-minute medical time-out for a treatable condition.
The three rulebooks side by side (2026)
| Topic | Grand Slams | ATP | WTA |
|---|---|---|---|
| Repeat time violation by the server | Fault | Fault, announced as "Time Violation, 2nd Service" | Fault |
| Repeat time violation by the receiver | Point penalty | Point penalty | Loss of point |
| Visible clock required | Not specified in the rule book | Shot clocks at all ATP Tour events | Serve clocks at WTA 1000 Mandatory, 500 and 250 events |
| Who decides on default after the third code violation | Referee with the Grand Slam Chief of Supervisors | Supervisor | Supervisor or referee |
Both tours also provide for a 10-minute heat break before the third set of best-of-three singles. The ATP's 2026 heat policy offers a cooling break before the third set, on request, once its heat threshold is reached. The WTA's time-limits table includes a 10-minute heat-rule break between the second and third sets.
Toilet breaks follow the same logic of limits plus time violations. In Grand Slam men's matches a player gets one toilet break in best of three sets and two in best of five, taken at set breaks. In best of five, only one may be taken during the first three sets, and the second only after the third set ends. Each is capped at three minutes. Overstaying draws back-to-back time violations.
Why the rules look like this
Read as a whole, the conduct rules defend two things: the opponent's right to a continuous match, and the officials' authority to keep it that way. The clock, the medical limits and the escalating ladder all stop one player from controlling the rhythm of a match at the other's expense. Because the penalties are paid in points and games, a code violation at 5-5 can cost far more than the same one at 1-1. Tennis scoring for beginners shows how quickly a single point can turn into a game or a set.
Those pressure moments are also what Reign Creative's tennis career simulator is built around: you decide how to serve, return, defend and attack when a match is on the line, and around the matches sit coaches and support staff, rivals and sponsorships. It is a fictional game with no link to any real tour or governing body, so nothing in it describes how a real umpire would rule. For the rules of play themselves, the tennis hub is the place to start, and the studio's other titles are under sports career and GM games.
Good to know
Frequently asked questions
What is a code violation in tennis?
What are the penalties for code violations?
How does the shot clock work in tennis?
How long is a medical timeout in tennis?
Can a player get a medical timeout for cramp?
Sources
- 2026 Official Grand Slam Rule Book (opens in a new tab)Grand Slam Tennis — accessed
- The 2026 ATP Official Rulebook (opens in a new tab)ATP Tour — accessed
- 2026 WTA Official Rulebook (opens in a new tab)WTA — accessed
- ITF Rules of Tennis 2026 (opens in a new tab)International Tennis Federation (ITF) — accessed
League, team and athlete names appear here only to identify the rules, records and history being discussed. Reign Creative LLC's sports games are not affiliated with, endorsed by or licensed by any league, team, players' association or athlete, and all names and marks belong to their owners.
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