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Marketa Vondrousova has vowed to clear her name after receiving a doping violation related to a missed test—and she could be facing up to a four-year ban from tennis.

The incident dates back to an out-of-competition drug test in December. According to Vondrousova, an officer rang her doorbell after 8 p.m., refused to identify himself and demanded an immediate urine test. In an Instagram Story at the time, a shaken Vondrousova said she refused to let him in and called it a “serious intrusion of my privacy.”

Now, she’s been charged by the ITIA for “refusing or failing to submit to Sample collection without compelling justification after notification by a duly authorized Person.”

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On Friday, the 2023 Wimbledon champion took to social media to share her side of the story. Vondrousova opened up about the mental toll of injuries and sleep issues, as well as “years of hateful messages and threats” that caused her to hit a breaking point and “affected how safe I feel in my own space.”

“When someone rang my door late at night without properly identifying themselves or following protocol—I reacted like a person who felt scared,” she wrote in a lengthy message. “In that moment, it was about feeling safe, not about avoiding anything.”

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Vondrousova also said the unexpected late-night visitor triggered memories of her countrywoman Petra Kvitova’s 2016 stabbing—when a man posing as an electrician gained access to the two-time Wimbledon winner’s apartment and attacked her with a knife, severely injuring her playing hand.

The 26-year-old said that “fear clouded her judgment,” adding that the situation caused her to suffer anxiety and have an acute stress reaction.

“Experts confirmed I suffered an Acute Stress Reaction (F43.0) and Generalized Anxiety Disorder (F41.1)," Vondrousova wrote. "In that moment, fear clouded my judgment and I just couldn’t process the situation rationally. After what happened to Petra (Kvitova), we don’t take strangers at our door lightly."

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The ITIA has confirmed that an investigation is underway, although the charge does not come with an automatic suspension. Vondrousova has not played a singles match since January due to an ongoing shoulder injury, but did suit up for Czechia in BJK Cup doubles over the weekend.

“We can confirm that an investigation is underway and the player has been charged with refusing a test. At this stage, we are not able to comment any further on the specifics.”

Tennis players are required by the ITIA and WADA to log their Whereabouts as part of anti-doping protocols. They must submit their address and designate a one-hour window each day for potential out-of-competition testing. However, out-of-competition testing can also occur outside of those designated whereabouts windows.

Vondrousova is next scheduled to compete at the Mutua Madrid Open, which begins on April 20.