Marketa Vondrousova, the 2023 Wimbledon singles champion, is suspended from tennis for four years after refusing to submit to an anti-doping test. Multiple outlets report that the sanction is issued by the sport’s governing anti-doping body, the International Tennis Integrity Agency, following an incident in early December 2025. Sources say the player was notified by a doping control officer out of competition at her home on the night of 3 December 2025 and was asked to provide a sample. Vondrousova disputes the circumstances, saying she experienced an “acute stress reaction” and mental distress when a tester arrived late at night and that the officer did not properly identify themselves. However, at least one report states an independent tribunal found there was “no compelling justification” for her failure to submit a sample when notified. As a result, she receives a four-year ban from professional tennis. The reported decision is framed as a consequence of refusing the test rather than of any positive drug result. The sanction takes effect following the announcement by the anti-doping authorities and concludes related proceedings over the December 2025 incident.