An independent tribunal has suspended Czech tennis player Markéta Vondroušová for four years for refusing an anti-doping test in December 2025.
Vondroušová, who reached a career-high world singles ranking of 6 in September 2023, did not submit a sample when notified by a Doping Control Officer (DCO) during an out-of-competition test attempt at her home at around 8pm on 3 December 2025.
Under anti-doping rules, the starting point for a sanction when a player refuses a test must be the same as if they had tested positive. This is to ensure that anyone who is doping cannot serve a shorter ban simply by refusing to be tested.
International Tennis Integrity Agency (ITIA) CEO, Karen Moorhouse said: “We understand that the testing process is uncomfortable, and acknowledge that it is an additional burden for players whose jobs already come with a high level of pressure and scrutiny, but it is essential to protect fair competition.
“Safety and welfare of players and our testers is really important to us. Our testers are well-trained, professional, and the gender of our testing witness always matches the player. They carry ID at all times, and players are able to verify their identity in other ways if they are ever unsure.”
During the hearing, 26-year-old Vondroušová presented explanations that stress and poor mental health had affected her decision making, in addition to concerns for her safety.
The tribunal considered this in their decision, as well as testimony from the Doping Control Officer who attempted to conduct the test, and concluded that the evidence offered “no compelling justification” for the test refusal.
ITIA CEO, Karen Moorhouse continued: “Unpredictable testing is an essential tool to protect clean sport.
“The independent tribunal ultimately supported that principle. This case is an important reminder that players can be tested at any time, in any place, and that refusal comes with significant risk.”
The full written decision will be issued in due course. The player, the ITIA, and the player’s National Anti-Doping Organisation have a right to appeal the decision to the Court of Arbitration for Sport.
As with all ITIA cases, independent and confidential wellbeing support will be made available to Vondroušová through our player support programme.
Vondroušová’s suspension will end on 21 June 2030.
While suspended, Vondroušová is not allowed to play in, coach at, or attend any events organised or sanctioned by the ITF, WTA, ATP, the Grand Slams, or any national association.
To access the operative decision, click here.
Ends
Published 22 June 2026 14:30
