The ‘Silent Ban’ and Other Monsters: Trust in ‘Clean’ Tennis and Its Weaknesses

In recent days, many fans of players who achieved major results during the period known as the Silent Ban have questioned the legitimacy of the Wimbledon 2025 outcomes, due to the positive tests (for unintentional contamination) returned by Swiatek and Sinner.

It is therefore worth examining how solid the belief really is that Swiatek and Sinner were treated too leniently — especially when compared to the equally widespread belief that the Big 3, the Big 4, and the leading players of previous eras were entirely “clean”.

To do so, we need to take a closer look at how anti-doping procedures in tennis were structured prior to 2016.

Introduction: The Pre-WADA Anti-Doping Landscape in Tennis

The Embryonic Phase: The Men’s International Professional Players Council (MIPTC)
Before the advent of a global and standardised anti-doping system, the governance of professional tennis was a mosaic of fragmented interests, a reality fully reflected in its early attempts to regulate substance use. During the 1980s, responsibility for testing fell to the Men’s International Professional Players Council (MIPTC), a body with a complex and confusing governance structure that brought together representatives from the players (ATP), the international federation (ITF), and tournament directors. This mixture of roles was an early, clear indicator of the tensions and potential conflicts that would characterise the fight against doping in the sport for decades.
The programme managed by the MIPTC was also limited in its scope. Its focus was explicitly on detecting “recreational substances” such as cocaine, marijuana, and methamphetamines, rather than a systematic investigation into the use of performance-enhancing drugs (PEDs) capable of altering athletic performance. This distinction is fundamental, as it frames the mentality of the era: anti-doping was conceived more as a tool for discipline and managing the public image of players, aimed at preventing scandals related to lifestyle, than as a serious attempt to ensure a level playing field. The system was, by its nature, ill-equipped to address the growing complexity of scientific doping.

The 1990 Revolution: The ATP Tour and a Shift in Perspective
The year 1990 marked a watershed moment in the structure of men’s tennis. With the dissolution of the MIPTC and the birth of the ATP Tour, a circuit managed directly by the players, responsibility for the anti-doping programme passed into the hands of the players’ association itself. This change brought with it a significant evolution: the new ATP Tour programme explicitly extended testing to include performance-enhancing drugs, marking the beginning of a fight against doping closer to how we understand it today.
However, this progress was accompanied by an intrinsic structural problem. The ATP’s assumption of anti-doping control was a direct consequence of the players’ takeover of the governance of the men’s circuit. While the inclusion of PEDs was a step forward, entrusting this power to an organisation whose primary purpose was to promote and enrich its own members (the players themselves) created a fundamental and systemic conflict of interest from its inception. The model of self-regulation, where the controller and the controlled are one and the same, laid the groundwork for the controversies and accusations of bias that would tarnish the credibility of tennis for years to come.

The Governance Structure of the 1990s: A Fragmented and Conflicted Authority

The Tennis Anti-Doping Programme (TADP): A Unified Name, a Divided Reality
In 1993, the International Tennis Federation (ITF), the Association of Tennis Professionals (ATP), and the Women’s Tennis Association (WTA) Tour created a joint initiative called the “Tennis Anti-Doping Programme” (TADP). However, the programme was “joint” in name only: although the ITF, ATP, and WTA published common rules, each circuit managed its own cases independently until consolidation occurred between 2006 and 2007. It was not, therefore, a centralised and independent programme as the name might suggest.
The crucial point is that, despite the common umbrella of the TADP, each governing body maintained full authority over the management of its own events and, above all, over the handling and adjudication of doping cases arising from them. This meant that for any ATP Tour tournament, it was the ATP itself that was responsible for conducting tests, managing results, and imposing any sanctions. This fragmented and siloed structure remained in place throughout the 1990s, including 1997, the year of the famous Andre Agassi case. The transition to a centralised system came much later: the ITF assumed full responsibility for the ATP’s anti-doping programme only from 2006, and for the WTA’s from 2007.
This approach not only perpetuated the ATP’s inherent conflict of interest but also prevented the creation of a truly independent and impartial system for over a decade.

The Procedural Framework: An Insular System
The legal basis for the ATP’s jurisdiction was contractual. At the beginning of each year, professional players were required to sign a consent form by which they agreed to be bound by all applicable rules, including the TADP managed by the ATP.
The procedure for an anti-doping rule violation involved the appointment of an Anti-Doping Tribunal by the “Administrator of the Rules of the applicable tennis governing body”—which, in the context of an ATP tournament, was an ATP official. In that era, the role of the Court of Arbitration for Sport (CAS) in Lausanne was still marginal; the main adjudicating body was an internal ATP tribunal, whose decisions were often final within the organisation. This system stands in stark contrast to the modern framework, where CAS serves as the final and independent appellate body for all parties involved.
The first tennis player to be sanctioned under this system was the Spaniard Ignacio Truyol. In 1997, he was suspended for one year by the ATP after testing positive for nandrolone and pemoline during a test at a Challenger tournament in 1996. Truyol stated that he felt like a “guinea pig” and prophetically claimed that a top player like Andre Agassi would not have been treated in the same way, highlighting the perception of a two-tiered justice system.

Case Study: Andre Agassi (1997) and the Manifestation of Conflict of Interest

The Confession: “A Letter Full of Lies”
In 2009, with the publication of his autobiography “Open,” Andre Agassi shook the foundations of the tennis world. In the book, he confessed to testing positive for methamphetamine (crystal meth) in 1997. After being informed of the positive result by an ATP doctor, Agassi, facing the prospect of a three-month ban, decided to write a letter to the organisation.
The heart of that letter was, by his own admission, a lie. The “central lie” was the claim that he had ingested the substance “unwittingly” by drinking from a soda that his assistant, “Slim,” had spiked with the drug. The ATP, after reviewing the case, accepted his version of events and dismissed the matter. No sanction was imposed, and the entire affair remained secret for 12 years, until the book’s publication.
In Agassi’s words, the letter he sent to the ATP revolved around what he later called “a central lie”—the claim that he had ingested crystal meth unwittingly via a spiked soda handed to him by his assistant.

A Flawed System from the Outset
The ATP’s decision to cover up the Agassi case was not an anomaly or a procedural error, but the direct and predictable result of its inherent conflict of interest. As the body responsible for both the commercial promotion of the sport and the disciplinary control of its players, the ATP’s economic interests were inevitably paramount.
In 1997, even during a period of difficulty, Andre Agassi was one of the most recognisable and commercially valuable faces in world tennis. A doping ban would have caused incalculable damage to the image and finances of the ATP Tour. The ATP’s action represents a textbook example of an “organisational conflict of interest,” a situation where an organisation’s duty to ensure integrity is compromised by its own institutional objectives, such as revenue and reputation. The indignant reaction of the nascent anti-doping community, once the facts were revealed in 2009, confirms the inadequacy of the ATP’s handling of the matter. The then-president of the World Anti-Doping Agency (WADA), John Fahey, publicly called on the ATP to “shed light on this allegation,” highlighting the total absence of transparency and an independent process.

The Ripple Effect: A Culture of Impunity and Distrust
The cover-up of the Agassi case had consequences far beyond the protection of a single player. It established a dangerous precedent of impunity for top players and fuelled a culture of distrust and suspicion that has continued to pervade the sport for years. It validated the bitter perceptions of lower-ranked players, like Ignacio Truyol, that a two-tiered justice system existed, where rules were applied rigorously to marginal players and with discretion to the stars.
When the governing body itself proves willing to hide the positive test of one of its biggest stars, the message sent to all other athletes is unequivocal: the rules are not the same for everyone. This undermines the principle of fair competition at its core and generates widespread cynicism among players, who begin to question the legitimacy of their opponents’ performances. The Agassi affair is not just a historical anecdote; it is the original sin from which much of the subsequent distrust in tennis’s integrity system stems, providing the factual basis for later, persistent accusations of “silent bans” and favouritism.

The “Silent Ban” and the Culture of Secrecy

Defining the Phenomenon
Directly linked to the culture generated by the Agassi case is the practice of the “silent ban.” This term describes an unpublicised suspension, often disguised by a plausible reason such as an injury, in order to protect the player’s reputation and, consequently, the image of the sport. Although this practice is distinct from the active cover-up of a positive test (as in the Agassi case), it arises from the same institutional impulse to prioritise image management over transparency.

The Road to Reform: From Agassi’s Confession to the ITIA

The Catalysts for Change
The transition from an opaque and conflicted system to a more transparent and independent one did not happen spontaneously. It was the result of a series of events and pressures that forced the world of tennis to confront its own shortcomings. Three main catalysts drove this process:
The WADA code (1999 → 2004): The World Anti‑Doping Agency (WADA) itself was founded in 1999, but the first World Anti‑Doping Code was only adopted in 2003 and entered into force on 1 January 2004.
Agassi’s Confession (2009): The public revelation of the 1997 cover-up triggered an unprecedented crisis of credibility for the ATP and the entire sport, generating enormous media and public pressure for genuine reform.
Consolidation under the ITF (2006-2007): The transfer of anti-doping responsibilities from the ATP and WTA to the ITF represented a first, important step towards centralisation, eliminating direct management by the tours. However, it did not yet achieve true independence, as the ITF itself is a governing body with its own interests.

The 2018 Independent Review Panel (IRP): A Damning Diagnosis
The decisive push for radical reform came in the wake of a scandal related to betting and match-fixing. In 2016, an Independent Review Panel (IRP) was established to conduct a comprehensive review of integrity in tennis. The conclusions of its final report, published in 2018, were an unsparing condemnation of the existing system.
Among the key findings:

The panel described the sport’s anti-corruption efforts as “inadequate” to deal with the nature and extent of the problem.
It identified a significant conflict of interest in the governance structure, highlighting the lack of independence of the Tennis Integrity Unit (TIU) from the governing bodies that funded and supervised it.
It described the economic structure of the lower levels of tennis, with low prize money and high costs, as a “fertile breeding ground for breaches of integrity.”
The IRP’s main recommendation was unequivocal: it was necessary to create a truly independent integrity body and grant it full autonomy over investigations and sanctions.

The Birth of the ITIA (2021-2022)
In direct response to the IRP’s findings and recommendations, the governing bodies of tennis (ITF, ATP, WTA, and the four Grand Slam tournaments) established the International Tennis Integrity Agency (ITIA) in 2021. The ITIA assumed full responsibility for the Tennis Anti-Doping Programme from 1 January 2022, finally unifying all integrity issues (anti-doping and anti-corruption) under a single, independent body.
The creation of the ITIA was not a voluntary act of goodwill, but the necessary outcome of a damning independent report. History, from the Agassi case to the IRP, shows a pattern of reactive governance, where significant change has occurred only as a result of public scandals and external investigations that have forced the hand of sporting institutions.

The Modern Framework in Action: A Direct Comparison

The Pillars of the Modern System
The current anti-doping system, managed by the ITIA, is founded on principles radically different from those of the 1990s. Its pillars are:
Independence: The ITIA is a legally and operationally independent body from the circuits and federations, which fund it but do not control its decisions.
Compliance with the WADA Code: The TADP is fully aligned with the World Anti-Doping Code, which includes the Prohibited List and the fundamental principle of Strict Liability. According to this principle, an athlete is responsible for any substance found in their body, and it is not necessary to prove intent to establish a violation.
The Central Role of CAS: The Court of Arbitration for Sport in Lausanne is the final and independent appellate body for all parties involved in a dispute: the player, the ITIA, and WADA itself, which has the right to appeal if it considers a sanction too lenient.
The Athlete Biological Passport (ABP): Introduced in tennis to monitor an athlete’s biological parameters over time, the ABP is a key tool for detecting doping indirectly, as demonstrated in the case of Simona Halep.

Contemporary Case Studies: Halep and Sinner

The recent high-profile cases of Simona Halep and Jannik Sinner, though controversial, perfectly illustrate the functioning of the modern system.
Simona Halep (2022): After testing positive for Roxadustat, Halep was charged by the ITIA, which added a second charge based on irregularities in her Athlete Biological Passport. An independent tribunal imposed a four-year ban. Halep appealed to CAS, which reduced the sanction to nine months, concluding that although the athlete bore some degree of fault, the violation was likely due to a contaminated supplement and that the ABP charge was not proven. Clarification — In its 2024 award, the Court of Arbitration for Sport dismissed the Athlete Biological Passport (ABP) charge in full (¶ 373), finding that the longitudinal haematological data did not reach the “comfortably satisfied” standard of proof required. The remaining analytical adverse finding (Roxadustat) was deemed most likely caused by a contaminated supplement, leading the panel to reduce the sanction from four years to nine months.

Jannik Sinner (2024): After testing positive for Clostebol due to accidental contamination from a cream used by his physiotherapist, the ITIA conducted a thorough investigation, and an independent tribunal issued a “No Fault or Negligence” decision. However, WADA, exercising its right of appeal, took the case to CAS, arguing that the athlete must still bear some responsibility for his team’s negligence. A settlement was reached for a three-month ban.
Regardless of their outcomes, these cases demonstrate a system governed by law and procedure, not discretion. The proceedings are public, the decisions are reasoned and published, and a plurality of independent bodies (ITIA, Independent Tribunal, CAS, WADA) provides the checks and balances that were completely absent in 1997. The contrast is stark: in the Agassi case, the ATP secretly dismissed the case; in the Sinner case, an independent agency (ITIA) investigated, an independent tribunal acquitted him, and another independent agency (WADA) appealed to a third independent body (CAS) to ensure the uniform application of the rules. This layered, adversarial, and transparent process is the antithesis of the unilateral and opaque decision-making of the 1990s.

Integrity Reclaimed but to be Guarded

It is undeniable that in 1997, the anti-doping programme for the men’s circuit was managed by the ATP, an organisation operating with a severe and systemic conflict of interest. The handling of Andre Agassi’s case was not a procedural error but the logical consequence of this flawed structure, where commercial and reputational protection prevailed over the duty to apply anti-doping rules impartially. The evolution towards the current system led by the ITIA represents a paradigm shift towards independence and transparency. This change was not spontaneous but is the result of decades of scandals, external pressures, and forced reforms that have gradually dismantled the old model of self-governance.
To avoid repeating the mistakes of the past and to uphold the credibility of the current system, it is crucial that tennis remains vigilant. The independence of the ITIA is the cornerstone of the modern system and must be safeguarded from any attempt at influence. The commitment to adequately fund integrity efforts must be maintained, as must the promotion of a culture of transparency to exorcise the ghosts of the “silent ban” era. Finally, continuous education for athletes and their support staff on the principle of strict liability and the risks of contamination is essential to prevent unintentional violations and protect clean athletes, thereby maintaining the trust that was so severely damaged in the past.