Once again Clostebol: the substance linked to Jannik Sinner leads to an American suspension

American teenager Jessica Eudovic, 18, is the latest player to face suspension by the International Tennis Integrity Agency (ITIA) after testing positive for Clostebol, the same substance for which Jannik Sinner was sanctioned a year ago.

The player holds a career-high ranking of World No. 1104 in the ITF singles rankings, achieved in October 2025. Exactly at the beginning of that month, Eudovic competed in the ITF World Tour W15 in Santa Tecla, El Salvador, where she tested positive for a metabolite of Clostebol, an anabolic steroid prohibited under ITIA regulations.

The American teenager is provisionally suspended and received a pre-charge notice of an Anti-Doping Rule Violation on November 21, 2025, following the analysis of two samples that tested positive for Clostebol. The report stated: "The sample was split into A and B samples and the subsequent analysis found that both samples contained a metabolite of Clostebol, which is prohibited under the TADP, in the category of Anabolic Androgenic Steroids."

On December 1, 2025, Eudovic filed an appeal, which was dismissed on December 16, 2025, by independent chair Dr. Tanja Haug, who stated that the basis of Eudovic’s appeal was "insufficient to meet the threshold required to lift a Provisional Suspension."

Consequently, Eudovic is prohibited from competing in any tennis tournaments or events authorized by the ITIA or member associations (ATP, ITF, WTA), as well as Grand Slams and their associated events (Tennis Australia, French Federation of Tennis, Wimbledon, or USTA), or any tennis association linked to these institutions.

This is the same substance that appeared in Jannik Sinner's samples in March 2024 at Indian Wells. After being notified, the Italian launched an appeal and avoided suspension during that same year. The World No. 2 lost the points and prize money earned at Indian Wells but initially emerged unscathed from the ITIA's determination.

Things changed towards the end of 2024 when the World Anti-Doping Agency (WADA) announced an appeal to the Court of Arbitration for Sport (CAS) — seeking a suspension of between one and two years for the 4-time major champion, reopening Sinner's case despite him being declared innocent of any fault or negligence in the first instance.

It was then that Sinner reached an out-of-court settlement with WADA — before the case returned to an independent tribunal. Sinner accepted a three-month suspension to close the doping chapter, missing competition between February and May 2025. He was absent from up to four Masters 1000 tournaments, marking his return around the middle of the clay swing at the Rome Open. In his first tournament back, he reached the final, falling to Carlos Alcaraz.

Just a week ago, the ITF confirmed the case of Juan Sebastián Domínguez Collado, a Guatemalan player who was also provisionally suspended due to a Clostebol case, a situation previously experienced by Italians Stefano Battaglino and Marco Bortolotti.