American Tennis Pro Among Two Provisionally Suspended by ITIA Over Latest Clostebol Cases
Pallina, Tennis Ball, ATP, Tennis Herren Dunlop, Clay, Monte Carlo Rolex Master 2026, primo piano, Close Up, single shot TENNIS ROLEX MONTE-CARLO MASTERS 2026 ©IMAGO/Buzzi When Jannik Sinner tested positive for the banned substance clostebol on March 18, 2024, shockwaves tore through tennis, casting a shadow over one of the sport’s brightest stars. Although the International Tennis Integrity Agency (ITIA) cleared him of “no fault or negligence,” the World Anti-Doping Agency (WADA) reignited the controversy, pursuing a ban that sidelined him for nearly three months. Now, almost two years later, clostebol has dragged tennis back into turmoil as two players ranked outside the top 500 face provisional suspensions after testing positive for the same substance.
The ITIA has provisionally suspended Latvia’s Karlis Ozolins and American player Daniil Kakhniuk after both tested positive for the banned substance clostebol . Ozolins is ranked No. 744, while Kakhniuk currently sits at No.
1,112 in the world rankings. Both players provided samples during an ITF World Tennis Tour event held in San Jose, Costa Rica, on February 17. The tests later revealed metabolites of clostebol, a steroid banned under anti-doping regulations in professional sports.
Clostebol, also known scientifically as “4-chloro-testosterone; 4-chloro-4-androsten-17-ol-3-one,” is classified as an anabolic androgenic steroid (AAS) derived from testosterone. The substance has long remained under strict scrutiny because of its performance-enhancing effects in athletes. KYIV, UKRAINE – SEPTEMBER 7, 2021: Sebastian BAEZ of Argentina shows the ball mark on a clay court during ATP Challenger Kyiv Open game against Illya BELOBORODKO of Ukraine at Kyiv Tennis Park in Kyiv In humans, among the legitimate therapeutic indications of anabolic steroids, clostebol acetate is approved for topical use in dermatological and ophthalmological preparations.
Experts have also noted that esterification on the 17 position allows oral use by protecting the compound from extensive first-pass metabolism. The drug has additionally been used in cattle to improve animal growth, further highlighting its anabolic properties. Because of those effects, both the International Olympic Committee (IOC) in the past and today the WADA have continued to include clostebol and other AAS substances on the annually updated prohibited list in sports.
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