Romania's Simona Halep is seen in action during her Wimbledon semifinal match against Kazakhstan's Elena Rybakina at the All England Lawn Tennis and Croquet Club, London, July 7, 2022. REUTERS/MATTHEW CHILDS

Two-time Grand Slam champion Simona Halep was provisionally suspended by the International Tennis Integrity Agency after failing a drug test during the U.S. Open in August.

The ITIA announced the punishment Friday for Halep, a former No. 1 player who is currently No. 9 in the WTA rankings. She won Wimbledon in 2019, beating 23-time major champion Serena Williams in the final, and the French Open in 2018.

In a social media post, Halep called the news of her positive test "the biggest shock of my life," adding: "Facing such an unfair situation, I feel completely confused and betrayed."

"I will fight until the end to prove that I never knowingly took any prohibited substance," Halep wrote, "and I have faith that sooner or later, the truth will come out."

Halep, a 31-year-old from Romania, announced in September she was taking the rest of this season off after having nose surgery to improve her breathing. She considered retiring early this year after a series of injuries, but then said she felt rejuvenated after teaming up in April with coach Patrick Mouratoglou, who used to work with Williams.

Seeded No. 7 at the U.S. Open, Halep lost in the first round to Daria Snigur of Ukraine 6-2, 0-6, 6-4 on Aug. 30. It was the first tour-level win of Snigur's career.

Spokesmen for the U.S. Tennis Association and Mouratoglou declined comment.

The ITIA said Halep tested positive in New York for the banned substance Roxadustat, a drug approved for medical use in the European Union to treat the symptoms of anemia caused by chronic kidney failure.

Halep said she was told her test showed "an extremely low quantity."

According to the EU's medicines agency, which approved Roxadustat last year, it stimulates the body to produce more of the natural hormone erythropoietin, or EPO, which has long been a doping product favored by cyclists and distance runners.

During a provisional suspension, a tennis player is ineligible to compete in, or attend, any sanctioned events.

Under the World Anti-Doping Code, Halep faces a ban of up to four years for a positive test for a substance like Roxadustat. Athletes can earn a reduction in their ban, likely to three years, if they quickly admit an offense and accept their sanction.

Tennis authorities will handle Halep's case and any ruling can be challenged by the World Anti-Doping Agency in an appeal to the Court of Arbitration for Sport.

"Today begins the hardest match of my life: a fight for the truth," Halep wrote Friday.

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