Match-Fixing Is Real: Evidence, How It Works, and the Limits of Prediction

Match-fixing is an agreement, act or deliberate omission to alter the result or course of a competition improperly, for an undue advantage. This definition follows the Council of Europe’s Macolin Convention, in our paraphrase (Council of Europe).

It need not concern the final score, and it need not be motivated by betting. Losing a single set, arranging cards, or withholding information can also count.

This article holds to one principle: match-fixing does happen and has been proven in many cases, but the existence of cases does not prove that any particular match was fixed, and it does not mean all matches are fixed. Only cases proven by official rulings are stated here as fact. All sources were accessed on November 13, 2026.

The table lists cases declared proven by official bodies: sports courts (CAS), federations or criminal courts. Note that a sporting ruling is not a prison sentence, and its standard of proof can differ from a criminal case. The list does not claim that every ruling is final on every appeal route.

A few lessons from the table: proof is made person by person (one player can be cleared in the same case), sanctions can be revised (the Vincent case), and trying to fix is not the same as succeeding (the Koellerer case), and manipulating part of a match still happens even when the player wins overall (the Anderson case).

• The people involved vary. Players, officials, clubs and intermediaries appear in the cases above, and FIFA includes referees and officials in its integrity reporting mechanism. Evidence of involvement must still be individual; not everyone on a team or in a match is involved (FIFA).
• Networks can cross countries. INTERPOL explains that the venue, the perpetrators, the placing of bets and the flow of money can be in different countries, so investigations need cross-jurisdiction cooperation (INTERPOL).
• There is pressure, not only money. In one snooker case the disciplinary tribunal found recruitment accompanied by threats and deletion of messages.
• Lower-level competitions are more vulnerable. A House of Lords committee report judged oversight, integrity education and access to reporting to be weaker at lower levels (committee report, paragraph 13). That is a risk assessment, not a prevalence figure and not a label on small leagues.
• Illegal betting markets are often part of the ecosystem. INTERPOL notes that profits and money laundering overlap with illegal betting markets. However, illegal betting, manipulation and money laundering are different categories, and not all illegal betting value comes from match-fixing.

Integrity bodies monitor price movements and betting patterns, then investigate what looks odd. The ITIA, tennis’s integrity body, stresses that an alert is not proof on its own, because there are legitimate explanations such as odds-setting errors, better information, physical condition, fatigue, form and personal circumstances (ITIA Annual Review 2025, p. 16).

What makes a case meaningful is usually a combination: communications, payment records, witnesses, match footage and market patterns that support each other. A direct approach offering a reward for improper conduct, a request to keep communication secret, or a threat is information worth reporting.

What should not be used as a detector by itself: a favourite losing, a late goal, a red card, a penalty, a goalkeeping error, a big scoreline, or a prediction that missed. All of these happen in honest matches. This conclusion is our analysis of the limits of evidence above, not an official list of indicators with measured accuracy.

Numbers about the scale of the problem are easy to misread. Three examples with their limits:

• The ITIA recorded 68 match alerts in 2025 and 95 in 2024. These are alerts from cooperation with the regulated betting industry, not the number of matches proven fixed, and not a census of all tennis. A fall in alerts does not automatically mean a fall in crime.
• Sportradar states that 99.5% of events monitored in 2023 raised no detected betting suspicion. This is a company’s claim about the coverage of its own system (Sportradar, third annual report), not an independent audit. Do not read it as “99.5% certainly clean”, nor “the rest were proven fixed”.
• The Indonesian police state that 18 suspects were processed during the 2018–2020 Match-Fixing Task Force (police release, 20 February 2023). That is a number of people processed, not convicted, and not a number of fixed matches.

Figures from different bodies must not be added together: one match can appear in several systems, and the definitions and units of counting differ.

There are two mistakes to avoid.

The first mistake: assuming honest sporting results are a random draw. They are not. Ability, tactics, condition and human decisions all matter. A probability model describes uncertainty; it does not assume all teams are equally strong.

The second mistake: assuming a simple prediction model can detect fixing. A tool like the probability calculator on this blog uses only the numbers you enter, such as average goals, and has no access to hidden agreements. A gap between a calculation and a result is not a diagnosis, and we give no accusation score to any club or player.

One precision: statistical and market analysis really is used by integrity bodies to screen for unusual matches. But that screen is only a starting point. Conclusions come from far fuller data, analysts, cooperation with other parties and investigation, not from a public score calculator.

So the honest position: match-fixing is real, a simple model cannot know hidden agreements from past scores and form, and an anomaly can be a lead to investigate, not a verdict. That is why any model’s output, ours included, should be read as an estimate that can be wrong. How to judge the strength of a number is covered in Sample Size and Uncertainty and Value Bets and Expected Value.

Legal context in Indonesia

Gambling is prohibited in Indonesia, including online; references include Articles 426–427 of the Criminal Code (Law 1/2023). Match-fixing, bribery, fraud, gambling and money laundering can overlap but are not automatically the same; the elements of the act and the proof decide. For bribery, Law 11/1980 Articles 2 and 3 cover giving and receiving promises or gifts connected with acts contrary to authority or duty that concern the public interest (official text, in Indonesian). This article does not state criminal penalties, because we have not checked the 2026 penalty-adjustment rules (Law 1/2026) in consolidated form, and this is not legal advice.

Reporting channels cited by official institutions

We have not tested report submission on any channel. Check the links on the official sites again before using them.

• Indonesia: your local police. The national police cite the 110 service for police assistance, free and available 24 hours (Polri, 8 February 2026). It is not a hotline specific to match-fixing. We do not list a dedicated PSSI integrity channel because it is unverified.
• Football: FIFA Reporting Mechanisms (portal: fifa.ethicspoint.com), and UEFA anti-match-fixing with the UEFA Integrity Line.
• Tennis: ITIA Contact, the Report Corruption option.
• Olympic Movement: IOC.
• Cross-border: INTERPOL advises reporting to local or national police, who can use INTERPOL coordination.

If you receive a suspicious approach: keep the original evidence, the time, the competition name, the context of the approach and a record of the communication; separate what you saw yourself from suspicion. Do not alter evidence, pose as a briber, or contact suspected parties to “test” them. If there are threats, put safety first and contact the police. This is advice on preserving evidence, not a guarantee of any legal outcome.

Five things to remember

1. Match-fixing is real and proven in many countries and sports.
2. The existence of cases does not prove a particular match was fixed, and does not mean all matches are fixed.
3. An odd sign is a starting point for investigation, not a verdict.
4. A simple prediction model, ours included, cannot know hidden agreements.
5. If there is a suspicious approach, keep the evidence and report to an official channel; do not test it yourself.

Mistakes we deliberately avoid

We do not write that all matches are fixed; do not accuse people who are only suspects; do not equate sporting sanctions with criminal ones; do not treat a prediction gap as evidence; do not use illegal betting figures as the value of match-fixing; and do not recommend sites or betting strategies on suspected matches.

Laws differ in every country. In Indonesia, gambling, including online, is prohibited by law. This article is written to understand the problem and how to report it, not as an invitation to bet.