Former Wimbledon champion Marketa Vondrousova was suspended for four years on Monday for refusing an anti-doping test, the latest high-profile player sanctioned by the International Tennis Integrity Agency (ITIA). The Czech player cited mental stress and fear after a testing agent arrived at her home late at night without properly identifying themselves.
Details of the Incident
The ITIA announced that Vondrousova refused a test in December 2025. An independent tribunal reached the maximum four-year ban for a routine first offense following a hearing this month. The agency said Vondrousova did not submit a sample when notified by a Doping Control Officer during an out-of-competition test attempt at her home at around 8 p.m. on 3 December 2025. Instead, she signed a refusal form.
Vondrousova, 26, became Wimbledon's first unseeded female champion when she beat Ons Jabeur in the 2023 final. She reached a career-high ranking of No. 6 that year and also reached the French Open final in 2019, losing to Ash Barty.
Vondrousova's Response
In an Instagram post in April, Vondrousova detailed her reaction to the missed test. “It is very tough for me to talk about this, but I want to be transparent with you about my mental health,” she said. “The recent doping control incident happened because I reached a breaking point after months of physical and mental stress.” After the ruling, she wrote: “I have never doped. I have never had a positive test. Throughout my entire career, I have undergone countless anti-doping controls and have always stepped onto the court with a clear conscience. Just three days after the incident that ultimately changed my life, I was tested again. The result was negative. Just like every test before it.”
Legal Representation and Context
Vondrousova was represented by Los Angeles-based lawyer Howard Jacobs, a specialist in doping rules cases. Jacobs helped two-time Grand Slam singles champion Simona Halep win an appeal case in 2024 at the Court of Arbitration for Sport against a four-year ban for doping. Vondrousova becomes the latest high-profile tennis player involved in a doping case after Halep, Jannik Sinner, and Iga Swiatek. Sinner accepted a three-month ban in a settlement with the World Anti-Doping Agency at the start of last year, and Swiatek accepted a one-month suspension at the end of 2024. Halep, Sinner, and Swiatek each proved they were not entirely responsible for their positive tests.
ITIA Statement
“We recognize this is a significant ban,” ITIA CEO Karen Moorhouse said. “You can’t have an anti-doping system where a player is in a better place by refusing to take a test than they would by taking a test and testing positive. So that feeds into the structure of the doping rules that provides for a starting point in the four-year ban for refusing to take a test.”
Vondrousova's ban expires June 21, 2030. She can appeal the decision to the Switzerland-based CAS. During a hearing before the tribunal, Vondrousova presented explanations that stress and poor mental health affected her decision making, in addition to concerns for her safety because she claimed the tester did not identify herself. The tribunal also took testimony from the doping control officer and concluded the evidence offered “no compelling justification” for the test refusal.
Testing Rules
Tennis players and other pro athletes are required by anti-doping rules to specify where they will be available for a one-hour period each day to give samples for testing. The female testing agent showed up at Vondrousova's home outside the assigned hour that the player signed up for that day — in a surprise test. Athletes are required to submit for testing if they are located for a surprise test outside their assigned hour. If they are not found when a tester shows up outside assigned hours, there is no sanction.
“Unpredictable testing is an essential tool to protect clean sport,” Moorhouse said. “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 ITIA would not say if any inconsistencies were found in Vondrousova's previous anti-doping history. “We wouldn't disclose that,” said Nicole Sapstead, the ITIA's senior director of anti-doping, adding: “We look at all things like that.” Vondrousova, ranked 122, hasn't played since January. Wimbledon starts next week.
