When the Machine Went Quiet: Wimbledon's Line-Calling Failure

Timeline

1. 2007Hawk-Eye's player-challenge system is introduced at Wimbledon.
2. 2022The US Open uses live electronic line calling, following the Australian Open.
3. Oct 9, 2024The All England Club says electronic calling will replace line judges on all courts from 2025.
4. Jul 2025Jack Draper and other players question the system's accuracy; the club defends it.
5. Jul 6, 2025The system is deactivated in error during one game of Pavlyuchenkova v Kartal; the point is replayed.
6. Jul 2025The club apologises, cites human error and removes manual deactivation.

The ethical issues

• Accountability when an automated system fails.
• Transparency about how errors happen.
• Fairness of the replay remedy to the affected player.
• Job losses for officials and the loss of an officiating pathway.
• Trust in technology versus trust in people.

Stakeholders

Stakeholder	Interests & obligations
Players	Correct calls and a fair remedy when calls fail.
The All England Club	Accuracy, efficiency and the tournament's reputation.
Chair umpires	Clear information and authority to act.
Line judges	Work, development and a route to the chair.
Technology provider	Reliability and reputation.
Spectators and broadcasters	Confidence in the result.

The case

Background

Hawk-Eye ball tracking has been part of Wimbledon since 2007, when players were first allowed to challenge line calls.^[1] For years the system checked human calls; it did not make them. That changed as other events went further. The Australian Open and then the US Open, in 2022, adopted live electronic line calling, and the men’s tour, the ATP, mandated it for its events from 2025.^[1]

On 9 October 2024 the All England Club announced that it would use live electronic line calling on all courts from the 2025 Championships, ending 147 years of human line judges.^[1] About 300 line judges had worked each year’s Championships, and officiating bodies worried about the loss of a pathway through which officials train for the umpire’s chair.^[1]

The rules and governance

Under the new system, cameras tracked every ball and an automated voice called “out” or “fault.” The chair umpire remained in charge of the match. Wimbledon’s rules set out what happens if the system fails: the chair umpire may make a call if confident, and otherwise the point is replayed.^[2]

Before the incident, players had questioned whether the system was always right. British No. 1 Jack Draper said he did not think it was “100% accurate,” citing marks he could see on the grass. Wimbledon’s Jamie Baker defended its reliability, noting it was used across the sport. A match involving Ben Shelton was stopped in fading light because officials were not comfortable continuing, the club said, not because the system had failed.^[4]

Decision point: a ball that was not called

On 6 July 2025, in a fourth-round match on Centre Court, Anastasia Pavlyuchenkova of Russia was playing Britain’s Sonay Kartal. During the match, the system was deactivated in error on part of the court for one game.^[2] Three calls were missed. Umpire Nico Helwerth, who had not been told that the system was off, made two of them himself.^[2]

The third came at 4-4, with Pavlyuchenkova at game point. A backhand from Kartal appeared to land long, but no call came. Helwerth stopped play and, following the rules, ordered the point replayed. Kartal won the replayed point and went on to break serve to lead 5-4.^[2][6] Pavlyuchenkova said the game had been “stolen” from her.^[2][6] She went on to win the match.^[6]

Decision point: what the club owed

The club had to explain what had gone wrong and decide what to change. It apologised to the players, said the problem had been human error by an operator, and said it retained full confidence in the system’s accuracy.^[2][3] It then removed operators’ ability to deactivate the ball-tracking system manually.^[3] The incident fuelled wider debate about the decision to replace line judges.^[5]

Aftermath

The change itself stayed. The procedural fix was intended to prevent the same failure happening again.^[3] The incident nevertheless became a reference point in debates about officiating technology across sport, because it showed that an automated system still depends on people, and that when it fails the player may have no way to recover what was lost.^[5]

The core dilemma

A tournament replaces human officials with technology it believes is more accurate. When an operator’s mistake silences the system at a key moment, the rules offer a replay, but the player who lost a likely game believes the remedy was not fair. Who is accountable when automated officiating fails, and is a more accurate system worth what is lost when it goes wrong?

Competing values

• Accuracy vs. resilience: machine precision on most calls against the effects of a single silent failure ^[2][3].
• Efficiency vs. employment: fewer officials against jobs and the officiating pathway ^[1].
• Procedural fairness vs. outcome fairness: a replay that follows the rules against the position the player had earned ^[2].
• Confidence vs. candour: defending the system against acknowledging its limits ^[3][4].

Strongest arguments

For electronic calling: ball tracking is more accurate than the human eye on fast serves, and every major event is moving that way ^[1]. The failure was human, not technical, and the club fixed the process quickly ^[3].

For caution: the incident showed that removing line judges also removed a backup who could have made the call ^[2]. Players cannot challenge an automated call the way they once challenged humans, so errors are harder to correct ^[4]. The replay rule protected procedure but did not restore Pavlyuchenkova’s game point ^[2].

On accountability: the club apologised and changed its controls ^[2][3]. Critics asked whether an incident report should have been published.

Applying the frameworks

Justice

A justice lens asks whether the remedy treated both players fairly. A replay is neutral in form but not in effect: it erased the advantage Pavlyuchenkova would have had if the call had been made ^[2]. Justice also asks about line judges, who bore the cost of a change that benefits the tournament ^[1].

Utilitarian

A consequentialist compares outcomes. If electronic calling makes thousands of calls more accurate, a rare failure may be an acceptable cost ^[3]. But the calculation includes lost trust, the cost to officiating careers and the harm to a player at a decisive moment ^[1][2].

Kantian

A Kantian lens asks what duties the organizers owed the players. One is honesty about how the system works and fails ^[3]. Another is that players should not be treated merely as means to an efficient tournament: they are owed a system that tells the umpire, immediately, when it stops working ^[2].

Walk it through: the Simple Decision Model

1. Spot the issue. You are the referee’s office at Wimbledon on 6 July 2025. The stakeholders include both players, the chair umpire, the technology provider, the operators, line judges who no longer work the event, and fans.
2. Gather facts. You know three calls were missed and the system was off for one game; you do not yet know why. Watch for automation bias: trusting the system’s record over the evidence of the failure.
3. Test options. Option A: say only that the rules were followed. Option B: apologise, explain the cause and change the controls. Option C: do B and publish a full incident review.
4. Check codes and law. The tournament rules provide for the umpire to call or for the point to be replayed ^[2]. The letter was followed; the spirit, a fair contest, was harder to meet.
5. Decide and document. Record what failed, why the remedy was chosen and what changes will prevent a repeat.
6. Communicate and follow up. Tell both players and the public, alert umpires when systems go down, audit operator controls and track calls that are disputed.

What’s settled and what’s contested

Settled: Wimbledon replaced line judges with electronic calling in 2025; the system was deactivated in error for one game of Pavlyuchenkova v Kartal; three calls were missed and a point was replayed; the club apologised and removed manual deactivation ^[1][2][3].

Contested: whether the replay was fair, how accurate the system is on every call, and whether the gain in accuracy justifies removing human line judges ^[4][5].

Why this case matters

Sport is automating officiating faster than it is deciding who is accountable when the machines fail. Compare MLB’s Automated Ball-Strike Challenge System and VAR and Luis Díaz’s Disallowed Goal.

Key terms

Trust

The public’s belief that what they are watching is real. Integrity failures are ultimately failures of trust.

Fair play

Integrity put into practice: respecting both the written rules and the spirit of competition.

Integrity

A commitment to honesty and ethical principle in competition and administration, including when nobody is watching.

Controls

Concrete safeguards that make ethics operational: training, disclosure forms, testing, monitoring, hotlines. Ethics needs principles, process and controls.

Institutional accountability

Structures that make a sport organization explain its decisions and face consequences: clear authority, transparency, appeals, independent oversight and enforcement.

Rules vs. spirit of the game

Rules are the written minimum; the spirit is the fairness and respect the rules exist to protect. Rules set the floor; spirit sets the ceiling.

Definitions from the Ethics Cases glossary.

Discussion questions

1. Was replaying the point a fair remedy for Pavlyuchenkova?
2. Who should be accountable for an operator's error: the operator, the provider, the tournament or the umpire?
3. Should automated calls be open to challenge by players?
4. What is lost when line judges disappear, beyond the calls themselves?
5. Should tournaments publish incident reports when officiating technology fails?

Sources

1. You cannot be serious? Wimbledon abolishes line judges after 147 years — The Guardian
2. Wimbledon 2025: Organisers apologise after missing three calls after electronic line-calling system deactivated in one game — BBC Sport
3. Wimbledon 2025: Changes made to electronic line calling after 'human error' — BBC Sport
4. Wimbledon chiefs defend AI use as Jack Draper says line calls not '100% accurate' — The Guardian
5. You cannot be serious! Wimbledon line-calling system under fire after major glitch — Reuters
6. Wimbledon hit with electronic line call controversy as Anastasia Pavlyuchenkova says game was 'stolen' from her — CNN