The International Tennis Integrity Agency (ITIA) today confirms that Juan Sebastian Dominguez Collado, a 23-year-old tennis player from Guatemala, has been provisionally suspended under the Tennis Anti-Doping Programme (TADP).
The ITIA sent the player a pre-charge notice of an Anti-Doping Rule Violation on 19 November 2025 under Article 2.1 of the TADP (presence of a Prohibited Substance in a Player’s Sample) and/or Article 2.2 (Use of a Prohibited Substance without a valid Therapeutic Use Exemption (TUE)).
Dominguez Collado, who reached a career-high world singles ranking of 1660 in October 2025, provided an in-competition sample while competing in an ITF World Tennis Tour M15 event in Kayseri, Turkey, on 2 October 2025.
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 (Section S1.1 of the 2025 World Anti-Doping Agency Prohibited List).
Clostebol is a non-Specified substance, and Dominguez Collado did not possess a valid TUE for the substance.
Findings for non-Specified Substances carry a mandatory provisional suspension – in Dominguez Collado’s case, this has been in effect from 19 November 2025. Players have the right to appeal the imposition of their provisional suspension before an independent tribunal chair. To date, Dominguez Collado has not appealed.
While provisionally suspended, Dominguez Collado is prohibited from playing in, coaching at, or attending any tennis event authorised or sanctioned by the members of the ITIA (ATP, ITF, WTA, Tennis Australia, Fédération Française de Tennis, Wimbledon and USTA) or any national association.
The ITIA is an independent body established by its tennis members to promote, encourage, enhance, and safeguard the integrity of their professional tennis events.
Ends
Published 17 December 2025 16:00
