Electronic officiating is changing tennis: technology from major tournaments is reaching local courts ever faster
Electronic line calling in tennis is no longer just an attraction reserved for Grand Slam tournaments and television broadcasts of the biggest matches. Systems that use cameras, computer models and automated voice announcements to decide whether the ball landed in the court or outside it have become one of the most important technological shifts in modern tennis. What for years was recognizable as the Hawk-Eye challenge, a brief moment of tension in which the crowd waits for an animated display of the ball’s trace, is now turning into an everyday part of professional officiating. The change is especially visible after decisions by leading organizations to move at more and more competitions from human line judges to systems that make decisions in real time. At the same time, another, perhaps even more important chapter is opening: the technology is gradually moving down from the elite level toward university, junior, club and recreational courts.
From player challenges to automatic calls in real time
Electronic line calling, known as ELC, emerged as an aid to umpires and players in situations in which the human eye can hardly reliably distinguish millimetric differences. In an earlier phase, the technology was most often used in the form of a challenge: a player would dispute a decision, and the system would subsequently show an estimate of the place where the ball landed. Such a model was long part of tennis dramaturgy because the decision arrived after a short pause, with reactions from the crowd and players. The new wave of technology, however, goes beyond challenges. ELC Live or real-time ELC systems track the point in real time and immediately announce out, removing the need for most traditional line calls on court.
As early as 2023, the ATP announced that from the 2025 season it would introduce Electronic Line Calling Live at all tournaments on its main tour. According to that decision, the system covers all lines and all out calls during matches, and the role that line judges performed for decades is transferred to certified technology. The organization explained at the time that the goal was to increase the accuracy and consistency of officiating across different tournaments and surfaces. With this, men’s professional tennis made one of the clearest institutional shifts toward automated officiating. The decision is also important because it standardizes the player experience: instead of different practices from tournament to tournament, ELC Live becomes an expected part of the professional environment.
Wimbledon as a symbol of a change in tradition
The greatest symbol of the shift was Wimbledon, a tournament that for decades cultivated the recognizable image of line judges in formal clothing. From 2025, the All England Club introduced electronic line calling on all match courts, ending the period in which line judges were one of the visual signs of the tournament. Official Wimbledon announcements state that the Hawk-Eye system was installed on all 18 match courts, with a dedicated operational infrastructure and a team supervising the system’s work. The change was not only technical, but also cultural: one of the most traditional sporting events accepted a model that directly changes the look and rhythm of a match.
The introduction of technology at Wimbledon did not pass without debate. During the 2025 tournament, an incident was also recorded in which the system had not been properly active for several points, which organizers attributed to human error in operational supervision, and not to the computer tracking of the ball itself. That case showed that automated officiating does not completely remove the human factor, but moves it from the space beside the line into control rooms, verification procedures and technical infrastructure. At the same time, the debate opened the question of trust: tennis needs technology that is not only accurate, but also clearly explainable to players, umpires and the public when something goes wrong.
How the technology that sees out works
Electronic officiating systems rely on a combination of cameras, computer vision, court calibration and ball-trajectory modeling. In the best-known professional systems, several cameras placed around the court track the movement of the ball at high speed, and software reconstructs from those data the trajectory and place of contact with the surface. In the live model, the decision is turned into an automatic sound or visual signal almost immediately after the bounce. In practice, this means that the player no longer has to request a review, and the chair umpire relies on the electronic call for line questions, while retaining authority for other aspects of managing the match.
The technology is often described publicly as artificial intelligence, but it is more precise to speak about systems of computer tracking and data processing. These systems require careful installation, calibration, testing and supervision, especially because court conditions are not always the same. Different surfaces, lighting, shadows, weather conditions and camera positions can affect the system requirements. That is why international rules and procedures do not view ELC as a simple consumer device, but as official technology that must meet criteria of accuracy, reliability, feasibility and suitability for competition. It is precisely at that point that professional technology meets the question of wider accessibility.
The ITF introduces classes that open the door to lower levels of tennis
In 2025, the International Tennis Federation announced new classification tiers for electronic line calling systems: Gold, Silver and Bronze. Until then, evaluation had been aimed mainly at systems for the highest, elite level of competition. The new approach is important because it acknowledges that the needs of a Grand Slam tournament, a professional tour, a university match or a local club competition are not identical. The Gold level is intended for the most demanding international competitions, while Silver and Bronze create a framework in which systems can be checked and used across a wider range of events. This does not lower the credibility criterion, but attempts to establish a proportionate standard for different levels of play.
The ITF’s evaluation procedures describe systems for real-time calls and systems for review, or challenge. The difference is important because recreational and developmental tennis does not always need the same level of automation as a professional match with a full officiating team. A review system can offer players, umpires or organizers subsequent confirmation of a disputed ball, while a real-time system takes an active role in every out decision. In both cases, official classification gives competition organizers a clearer framework for choosing technology. Without such a framework, the market could develop faster than the rules, which would increase the risk of uneven standards and disputes over the validity of decisions.
PlayReplay and the first serious step toward wider use
One example of technology showing what ELC could look like outside the largest stadiums is PlayReplay. In February 2026, the ITF announced that this system had met the criteria for real-time silver-level Electronic Line Calling on hard courts. According to the federation’s announcement, the system passed multi-phase testing that includes accuracy checks, choreographed tests, testing in match conditions, shadow operation, live testing and additional reliability checks. This classification is significant because it does not relate to the glamour of a major tournament, but to the possibility that verified technology can become available to the broader competitive ecosystem.
The United States Tennis Association had previously invested in PlayReplay through USTA Ventures, explaining that the technology can increase the availability of electronic officiating in junior, adult and recreational tennis. The USTA also announced the use of PlayReplay at selected junior national indoor championships, where players can use a screen beside the court to obtain ball-trace data, request a review and quickly see a display of the bounce location. Such examples show that the technology is no longer viewed only as a television add-on, but as a tool for solving a very practical problem: disputes over lines in matches that often do not have a full officiating crew.
Local courts are getting what until recently was unimaginable
On local courts, the issue of lines has a different weight than at major tournaments. In recreational and junior tennis, calls are often made by the players themselves, sometimes without an umpire and without a neutral person who can decide. That is part of the sporting culture of tennis, but also a source of frequent tension. One disputed ball can change the rhythm of a game, disrupt trust between players or leave an impression of injustice, especially in matches involving young players. In such an environment, an electronic system does not serve spectacle, but the calming of the situation and the creation of a clearer framework for play.
The availability of technology, however, does not mean that every club will overnight get a system like the one used in the largest stadiums. Professional ELC requires expensive equipment, precise installation, technical support and certified procedures. But a new generation of systems, including solutions that rely on a smaller number of cameras, screens beside the court or mobile devices, is gradually changing the economics of the entire area. Applications such as SwingVision have further popularized the idea that match analysis, automatic scoring, video clips and assistance with line decisions can become part of everyday play. Such tools are not necessarily the same as official systems for professional officiating, but they change players’ expectations about how much data and review can be available on an ordinary court.
The benefits are obvious, but the debate is not over
Supporters of electronic line calling point out several advantages. The first is consistency: a system that is properly installed and approved should apply the criterion equally throughout the entire match, without fatigue, changes of position or psychological pressure. The second is the reduction of conflicts between players and officials, because a debate about perception is replaced by a display and an automated decision. The third is data value. The same systems that call lines can create data useful for television broadcasts, coaching analysis, player development and statistical understanding of a match. In professional sport, these data are already part of the wider industry of broadcasting, training and commercial services.
Critics, however, warn that technology is not neutral in itself. It requires trust in the manufacturer, the certification body, operators and rules for the event of failure. The Wimbledon incident from 2025 served as a reminder that the problem does not have to lie in the algorithm for the result on court to be disputed. If cameras are not active, if the system is not properly calibrated or if communication between the technical room and the chair umpire fails, automation can create a new kind of ambiguity. That is why, alongside technological development, there is increasing discussion of protocols: who supervises the system, how a failure is recorded, what happens to a point in which the call was not registered and how the decision is explained to players.
What the change means for umpires, players and the development of the sport
The role of officials is not disappearing, but it is changing. Line judges in the traditional form are losing space at an increasing number of elite tournaments, while the need is growing for people who understand technology, protocols, system supervision and communication with the chair umpire. Hawk-Eye and professional tennis organizations have already developed training programs for officials who work with electronic systems, which shows that automation does not remove human expertise but moves it into a different working framework. For younger officials, this can mean fewer opportunities for classic experience beside the line, but also new specializations in sports officiating.
For players, the change is twofold. At the highest level, the space for arguing with line judges is reduced, but the tactical element of the challenge that could influence the rhythm of a match also disappears. At lower levels, technology can increase the sense of fairness, especially where matches are played without umpires. Still, there is also caution: tennis must not turn into a sport in which every local match depends on equipment, subscriptions and digital services. The healthiest development will probably be gradual, with a clear distinction between officially certified systems for competitions and auxiliary tools for training or recreational play.
Technology is no longer a question of the future, but of the level of application
Electronic line calling has entered a phase in which the main debate is no longer about whether it will be used, but where, under which conditions and with which standards. Professional tennis has already largely accepted automated calls, the ITF has opened the way to tiers that can cover a wider spectrum of competitions, and associations and clubs are testing solutions suitable for junior, university and recreational matches. This also changes the very idea of a fair point: the decision is no longer only a matter of the eye, position and moment, but the result of a system that must be technically precise, properly supervised and institutionally recognized. If this development continues with clear rules and realistic expectations, the technology that was once a sign of the most expensive courts could become the quiet infrastructure of everyday tennis.
Sources:
- ATP Tour – announcement on the introduction of Electronic Line Calling Live at ATP tournaments from 2025 (link)
- Wimbledon – official text on the introduction of electronic line calling on all match courts in 2025 (link)
- International Tennis Federation – new Gold, Silver and Bronze classification tiers for ELC systems (link)
- International Tennis Federation – announcement that PlayReplay received real-time silver status for hard courts (link)
- USTA – investment in PlayReplay for wider availability of electronic line calling in junior, adult and recreational tennis (link)
- USTA – application of PlayReplay electronic line calling at selected junior national indoor championships (link)
- Hawk-Eye Innovations – information on the experience of electronic line calling systems in tennis and the development of Hawk-Eye technology (link)
- Associated Press – report on the introduction of electronic calls at Wimbledon and reactions to the change (link)
- The Guardian – report on an error in the operation of the line-calling system at Wimbledon in 2025 (link)